data transfer: allow to save, delete files from conversation

Change-Id: I0087aa1e241358b41b79e21327fc2c699a54490b
diff --git a/ring-android/app/src/main/AndroidManifest.xml b/ring-android/app/src/main/AndroidManifest.xml
index 036e25f..e690f49 100644
--- a/ring-android/app/src/main/AndroidManifest.xml
+++ b/ring-android/app/src/main/AndroidManifest.xml
@@ -325,13 +325,8 @@
         <activity
             android:name=".client.MediaViewerActivity"
             android:label="@string/title_media_viewer"
-            android:theme="@style/AppThemeBase.Dark">
-            <intent-filter>
-                <action android:name="android.intent.action.VIEW" />
-                <category android:name="android.intent.category.DEFAULT" />
-                <category android:name="android.intent.category.OPENABLE" />
-                <data android:scheme="content" android:mimeType="image/*"/>
-            </intent-filter>
+            android:theme="@style/AppThemeBase.Dark"
+            android:exported="false">
         </activity>
     </application>