Stop allowing keeping app data on uninstall

Seems to be more trouble than it's worth since it makes the app uninstallable without manually deleting app data. Users have to go out of their way to save data into the app data folder now anyway.

app/src/main/AndroidManifest.xml

@@ -26,7 +26,6 @@
         android:name=".App"
         android:allowBackup="false"
         android:hardwareAccelerated="true"
-        android:hasFragileUserData="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:largeHeap="true"