Fix "no media" text alignment in conversation gallery

Fixes #7066
// FREEBIE

res/layout/media_overview_gallery_fragment.xml

@@ -16,7 +16,6 @@
               android:layout_height="match_parent"
               android:textSize="24sp"
               android:gravity="center"
-              android:paddingTop="30dp"
               android:visibility="gone"
               android:text="@string/media_overview_activity__no_media" />