Bug 1500068 - Avoid opening Add-ons panel when a location hash is passed to select another one. r=jdescottes

Doing this avoid loading the addons panel and doing its related requests,
which may still be pending after closing about:debugging.

MozReview-Commit-ID: LJjaE5YVgXi

Depends on D8867

Differential Revision: https://phabricator.services.mozilla.com/D8868

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

devtools/client/aboutdebugging/components/Aboutdebugging.js

@@ -60,7 +60,7 @@ class AboutDebuggingApp extends Component {
     super(props);
 
     this.state = {
-      selectedPanelId: defaultPanelId
+      selectedPanelId: window.location.hash.substr(1) || defaultPanelId
     };
 
     this.onHashChange = this.onHashChange.bind(this);
@@ -69,7 +69,6 @@ class AboutDebuggingApp extends Component {
 
   componentDidMount() {
     window.addEventListener("hashchange", this.onHashChange);
-    this.onHashChange();
 
     // aboutdebugging is not connected with a toolbox so we pass -1 as the
     // toolbox session id.