fixup! BB 40926: Implemented the New Identity feature

Fixed oncommands

browser/base/content/browser-sets.inc

@@ -408,5 +408,5 @@
          modifiers="accel,alt"
          internal="true"/>
 #endif
-    <key id="new-identity-key" modifiers="accel shift" key="U" oncommand="NewIdentityButton.onCommand(event)"/>
+    <key id="new-identity-key" modifiers="accel shift" key="U" command="cmd_newIdentity"/>
   </keyset>

browser/base/content/browser-sets.js

@@ -247,6 +247,9 @@ document.addEventListener(
           case "zoomWindow":
             zoomWindow();
             break;
+          case "cmd_newIdentity":
+            NewIdentityButton.onCommand(event);
+            break;
         }
       });