fixed normal bug (EXT-2393) Items aren't highlighted on mouse over in the Message Well

returned necessary attributes to the corresponding XML-files that were corrupted by Erica's commit (changesets 3991 and 3992)

--HG--
branch : product-engine

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

@@ -7,7 +7,9 @@
 	left="0"
 	height="35"
 	width="318"
-	background_visible="false">
+  background_opaque="false"
+  background_visible="true"
+  bg_alpha_color="0.0 0.0 0.0 0.0" >
   <chiclet_im_p2p
 		name="p2p_chiclet"
 		layout="topleft"

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

@@ -9,7 +9,10 @@
   width="300"
   height="35"
   layout="topleft"
-  follows="left|right">
+  follows="left|right"
+  background_opaque="false"
+  background_visible="true"
+  bg_alpha_color="0.0 0.0 0.0 0.0" >
   <text
     top="2"
     left="10"