Fix typo in my checin of bug 280590 (Pinstripe: Browser tabs should be focusable)

toolkit/themes/pinstripe/global/browser.css

@@ -65,7 +65,6 @@ tab[selected="true"] {
 
 tab:focus {
   margin-bottom: 2px !important;
-  padding-top: -1px !important;
   border: 1.4pt solid -moz-mac-focusring !important;
   -moz-border-radius-topleft: 50% !important;
   -moz-border-radius-topright: 50% !important;