Add resizer to Thunderbird. b=194081 r=me

browser/base/skin/browser.css

@@ -741,11 +741,6 @@ toolbar[mode="text"] > #window-controls > toolbarbutton > .toolbarbutton-text {
    display: none;
 }
 
-resizer[dir="bottomright"] {
-  -moz-appearance: resizer;
-  cursor: se-resize;
-}
-
 #sidebar-throbber[loading="true"] {
   list-style-image: url(chrome://global/skin/icons/Loading.gif);
 }

toolkit/skin/win/global.css

@@ -138,6 +138,11 @@ statusbarpanel {
   padding: 0px;
 }
 
+resizer[dir="bottomright"] {
+  -moz-appearance: resizer;
+  cursor: se-resize;
+}
+
 /* XXXBlake yeah, shoot me -- these don't belong here.  I'll move them later. */
 
 sidebarheader {