Default attacment progress indicator to invisible

Author: newmanw

mage/src/main/res/layout/attachment_viewer.xml

@@ -50,6 +50,7 @@
                 android:id="@id/progress"
                 android:layout_width="match_parent"
                 android:layout_height="match_parent"
+                android:visibility="gone"
                 android:background="@android:color/white">
 
                 <ProgressBar