Bug 1522315 - Reduce minimum horizontal padding for panel footer buttons. r=johannh

Differential Revision: https://phabricator.services.mozilla.com/D17482

--HG--
extra : moz-landing-system : lando

toolkit/themes/shared/global.inc.css

@@ -62,7 +62,7 @@
   color: inherit !important;
   min-width: 0;
   margin: 0;
-  padding: .9em;
+  padding: .9em 2px;
 }
 
 .panel-footer > button[disabled] {

toolkit/themes/shared/popupnotification.inc.css

@@ -70,7 +70,7 @@
 
 .popup-notification-dropmarker {
   flex: none;
-  padding: 0 15px;
+  padding: 0 15px !important;
 }
 
 .popup-notification-dropmarker > .button-box > hbox {