Bug 1572492 - Protections Panel message learn more link is incorrectly placed in RTL r=nhnt11

Differential Revision: https://phabricator.services.mozilla.com/D42287

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

browser/themes/shared/customizableui/panelUI.inc.css

@@ -1113,7 +1113,7 @@ panelview .toolbarbutton-1,
   content: url(chrome://browser/skin/back-12.svg);
   fill: currentColor;
   fill-opacity: 0.6;
-  float: right;
+  float: inline-end;
   transform: translateY(1px);
 }