Revert "Remove duplicate LAUNCHER declaration"

This reverts commit fccae7a.

Author: wosys

samples/connectivity/callnotification/src/main/AndroidManifest.xml

@@ -23,7 +23,13 @@
     <activity
         android:name=".CallNotificationSample"
         android:launchMode="singleTop"
-        android:exported="true" />
+        android:exported="true">
+        <intent-filter>
+            <action android:name="android.intent.action.MAIN" />
+
+            <category android:name="android.intent.category.LAUNCHER" />
+        </intent-filter>
+    </activity>
 
     <receiver android:name=".CallNotificationSample$NotificationReceiver"
         android:exported="false"/>

samples/user-interface/share/src/main/AndroidManifest.xml

@@ -35,6 +35,11 @@
             android:exported="true"
             android:label="@string/receive_share">
 
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+
             <!--
                 Handle ACTION_SEND intents to receive data shared by other apps.
             -->

samples/user-interface/windowmanager/src/main/AndroidManifest.xml

@@ -29,7 +29,13 @@
         <activity
             android:name=".demos.WindowDemosActivity"
             android:exported="true"
-            android:label="@string/windowManagerDemos" />
+            android:label="@string/windowManagerDemos">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
         <activity
             android:name=".DualScreenActivity"
             android:exported="false"