manifest: add hasFragileUserData

Change-Id: I965f79a1c6aca6121d65cca957aa2a9522124442

ring-android/app/src/main/AndroidManifest.xml

@@ -79,6 +79,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:resizeableActivity="true"
+        android:hasFragileUserData="true"
         android:supportsRtl="true"
         tools:ignore="UnusedAttribute"
         tools:replace="android:allowBackup">