adjuste manifext for sample

Author: ABTastyAdel

example/android/app/src/debug/AndroidManifest.xml

@@ -4,7 +4,7 @@
     -->
 
     <uses-permission android:name="android.permission.INTERNET"/>
-    <application android:label="com.example.flagship_qa" android:icon="@mipmap/ic_launcher" android:usesCleartextTraffic="false">
+    <application android:label="com.example.flagship_qa" android:icon="@mipmap/ic_launcher" android:usesCleartextTraffic="false" android:allowBackup="true">
         <activity android:name=".MainActivity" android:launchMode="singleTop" android:theme="@style/LaunchTheme" android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode" android:hardwareAccelerated="true" android:windowSoftInputMode="adjustResize">
 
           <intent-filter>