Fixed the crash when clicking/selecting a dataset

Prompt:

    When clicking on a dataset I am receiving this error

    ```
    ╭────────────────────────────────────────────────────────────────────────────────────────────────── Traceback (most recent call last) ──────────────────────────────────────────────────────────────────────────────────────────────────╮
    │ /home/sergio/Projects/sergiovibes/zfs-dashboard-python/src/zfs_dashboard/ui/screens.py:141 in on_dataset_tree_widget_selected                                                                                                         │
    │                                                                                                                                                                                                                                       │
    │   138 │   │                                                                                    ╭────────── locals ───────────╮                                                                                                        │
    │   139 │   │   # The message bubbles up from the tree.                                          │ message = Selected()        │                                                                                                        │
    │   140 │   │   # We can look at message.control.id to find the pool name                        │    self = DashboardScreen() │                                                                                                        │
    │ ❱ 141 │   │   tree_id = message.control.id # e.g. tree-tank                                    ╰─────────────────────────────╯                                                                                                        │
    │   142 │   │   if tree_id and tree_id.startswith("tree-"):                                                                                                                                                                             │
    │   143 │   │   │   pool_name = tree_id.split("-", 1)[1]                                                                                                                                                                                │
    │   144 │   │   │   details = self.query_one(f"#details-{pool_name}", DatasetDetails)                                                                                                                                                   │
    ╰───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
    AttributeError: 'NoneType' object has no attribute 'id'
    ```

Author: sergiogarciadev

src/zfs_dashboard/ui/screens.py

@@ -138,7 +138,7 @@ def on_dataset_tree_widget_selected(self, message: DatasetTreeWidget.Selected):
 
         # The message bubbles up from the tree.
         # We can look at message.control.id to find the pool name
-        tree_id = message.control.id # e.g. tree-tank
+        tree_id = message.tree_id # e.g. tree-tank
         if tree_id and tree_id.startswith("tree-"):
             pool_name = tree_id.split("-", 1)[1]
             details = self.query_one(f"#details-{pool_name}", DatasetDetails)

src/zfs_dashboard/ui/widgets.py

@@ -94,8 +94,9 @@ class DatasetTreeWidget(Static):
     dataset_filter = reactive("")
 
     class Selected(Message):
-        def __init__(self, dataset: Dataset):
+        def __init__(self, dataset: Dataset, tree_id: str):
             self.dataset = dataset
+            self.tree_id = tree_id
             super().__init__()
 
     def compose(self) -> ComposeResult:
@@ -170,7 +171,7 @@ def has_matching_child(self, dataset: Dataset) -> bool:
 
     def on_tree_node_selected(self, event: Tree.NodeSelected):
         if event.node.data:
-            self.post_message(self.Selected(event.node.data))
+            self.post_message(self.Selected(event.node.data, self.id))
 
 class DatasetDetails(Static):
     dataset = reactive(None)