Mark MainActivity launched as singleTask (#665)

Author: Goooler

app/src/main/AndroidManifest.xml

@@ -42,7 +42,7 @@
             android:configChanges="uiMode"
             android:exported="true"
             android:label="@string/launch_name"
-            android:launchMode="singleTop">
+            android:launchMode="singleTask">
             <intent-filter>
                 <action android:name="android.intent.action.APPLICATION_PREFERENCES" />
                 <action android:name="android.intent.action.MAIN" />