Show some buttons in media preview toolbar if there's room.

Fixes #11661

app/src/main/res/menu/media_preview.xml

@@ -4,14 +4,14 @@
     <item android:id="@+id/media_preview__forward"
           android:title="@string/media_preview__forward_title"
           android:icon="@drawable/ic_forward_24"
-          app:showAsAction="never"/>
+          app:showAsAction="ifRoom"/>
     <item android:id="@+id/media_preview__share"
           android:title="@string/media_preview__share_title"
           app:showAsAction="never"/>
     <item android:id="@+id/save"
           android:title="@string/media_preview__save_title"
           android:icon="@drawable/ic_download_filled_white_24"
-          app:showAsAction="never"/>
+          app:showAsAction="ifRoom"/>
     <item android:id="@+id/media_preview__overview"
           android:title="@string/media_preview__all_media_title"
           android:icon="@drawable/ic_photo_library_white_24dp"
@@ -19,5 +19,5 @@
     <item android:id="@+id/delete"
           android:title="@string/delete"
           android:icon="@drawable/ic_trash_24"
-          app:showAsAction="never"/>
+          app:showAsAction="ifRoom"/>
 </menu>