Opt-out of scoped storage

Signed-off-by: Alice Gaudon <alice@gaudon.pro>

src/main/AndroidManifest.xml

@@ -96,6 +96,7 @@
         android:installLocation="internalOnly"
         android:manageSpaceActivity="com.owncloud.android.ui.activity.ManageSpaceActivity"
         android:usesCleartextTraffic="true"
+        android:requestLegacyExternalStorage="true"
         tools:ignore="UnusedAttribute">
 
         <uses-library