Remove duplicate LAUNCHER declaration

There's no need to declare in samples' manifest.
Otherwise, it will create more icons in launcher.

Author: wosys

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

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

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

@@ -35,11 +35,6 @@
             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

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