Bug 1554241 - Apply different color to protections panel arrow in RTL to match gradient. r=johannh

Differential Revision: https://phabricator.services.mozilla.com/D33964

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

browser/themes/shared/controlcenter/panel.inc.css

@@ -209,6 +209,10 @@
   fill: rgb(100, 70, 228);
 }
 
+#protections-popup > .panel-arrowcontainer > .panel-arrowbox > .panel-arrow:-moz-locale-dir(rtl) {
+  fill: rgb(18, 90, 223);
+}
+
 #protections-popup-mainView-panel-header {
   color: white;
   background: linear-gradient(45deg, rgb(117, 67, 229), rgb(3, 96, 223));