Bug 1574847 - Fix the checkmark position on the main devtools options menu dropdown for RTL users r=pbro

Differential Revision: https://phabricator.services.mozilla.com/D42518

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

devtools/client/themes/tooltips.css

@@ -443,8 +443,9 @@ strong {
   background-position: center left 7px;
 }
 
+.tooltip-container[type="doorhanger"] .menuitem > .command[aria-checked="true"]:-moz-locale-dir(rtl),
 .tooltip-container[type="doorhanger"] .menuitem > .command[aria-checked="true"]:dir(rtl) {
-  background-position: center right 7px;
+  background-position-x: right 7px;
 }
 
 .tooltip-container[type="doorhanger"] .menuitem > .command > .label {