Bug 1580529 - Force LTR the Outline panel contents in the Debugger r=jlast

Differential Revision: https://phabricator.services.mozilla.com/D45554

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

devtools/client/debugger/src/components/PrimaryPanes/Outline.js

@@ -209,7 +209,7 @@ export class Outline extends Component<Props, State> {
     }
 
     return (
-      <ul className="outline-list devtools-monospace">
+      <ul className="outline-list devtools-monospace" dir="ltr">
         {namedFunctions.map(func => this.renderFunction(func))}
         {classes.map(klass => this.renderClassFunctions(klass, classFunctions))}
       </ul>