EXP-445 FIXED Skylight view hint shown in main viewer skin and not dismissed...

EXP-445 FIXED Skylight view hint shown in main viewer skin and not dismissed when using orbit pan zoom tools.
better fix that uses tag to isolate all skin specific notifications

indra/newview/skins/default/xui/en/notification_visibility.xml

 <?xml version="1.0" ?>
 <notification_visibility>
-  <hide name="HintMoveArrows"/>
-  <hide name="HintView"/>
+  <hide tag="custom_skin"/>
 	<show/> 
 </notification_visibility>
 

indra/newview/skins/default/xui/en/notifications.xml

@@ -6583,14 +6583,16 @@ Mute everyone?
   type="hint"
   unique="true">
     To walk, use the directional keys on your keyboard. You can run by pressing the Up arrow twice.
+    <tag>custom_skin</tag>
   </notification>
-  
+
   <notification
   name="HintView"
   label="View"
   type="hint"
   unique="true">
     To change your camera view, use the Orbit and Pan controls. Reset your view by pressing Escape or walking.
+    <tag>custom_skin</tag>
   </notification>
 
   <notification