Temporarily hide voice call

Signed-off-by: Mario Danic <mario@lovelyhq.com>

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

@@ -26,6 +26,7 @@
         android:id="@+id/conversation_voice_call"
         android:icon="@drawable/ic_call_white_24dp"
         android:title="@string/conversation_menu_voice_call"
+        android:visible="false"
         app:showAsAction="always"/>
 
     <item