Fix: correct MainActivity path in manifest from .MainActivity to .app.MainActivity

Author: SysAdminDoc

app/src/main/AndroidManifest.xml

@@ -29,7 +29,7 @@
         android:supportsRtl="true">
 
         <activity
-            android:name=".MainActivity"
+            android:name=".app.MainActivity"
             android:exported="true"
             android:theme="@style/Theme.OpenTasker">
             <intent-filter>