package.json: align snippetsPreventQuickSuggestions with VS Code default

Since vscode 1.79 (2023 May release), VS Code's
editor.suggest.snippetsPreventQuickSuggestions is false by default
so the extension doesn't need to override this.

https://code.visualstudio.com/updates/v1_79#_quick-suggestions-and-snippets

Fixes #1805

Change-Id: Iffaa6ab57b1f80c7d559e55c7886763bfe288dfc
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/502596
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jamal Carvalho <jamal@golang.org>

Author: hyangah

package.json

@@ -217,8 +217,7 @@
         "editor.formatOnSave": true,
         "editor.codeActionsOnSave": {
           "source.organizeImports": true
-        },
-        "editor.suggest.snippetsPreventQuickSuggestions": false
+        }
       }
     },
     "commands": [