Small CSS tweak to increase the hit area of the search engine selection

drop down on Mac OS X.

bug=337548
r=mconnor
uir=beltzner

browser/themes/pinstripe/browser/searchbar.css

@@ -34,7 +34,7 @@
   border: none;
   padding-right: 0px;
   height: 21px !important;
-  margin: 0px -5px 0px -1px;
+  margin: 0px -3px 0px -1px;
 }
 
 .search-go-button {