Add a proper data-id to the gr-account-dropdown

This is necessary to avoid having a brittle way of selecting the
settings and log-out button for integration testing.

Change-Id: Icde6fbd78248ee948282eb4c150a61d46e11c5d9
diff --git a/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.ts b/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.ts
index eb55177..ac3d5f4 100644
--- a/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.ts
+++ b/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.ts
@@ -141,14 +141,14 @@
     }
 
     const links: DropdownLink[] = [];
-    links.push({name: 'Settings', url: '/settings/'});
+    links.push({name: 'Settings', id: 'settings', url: '/settings/'});
     links.push({name: 'Keyboard Shortcuts', id: 'shortcuts'});
     if (switchAccountUrl) {
       const replacements = {path};
       const url = this._interpolateUrl(switchAccountUrl, replacements);
       links.push({name: 'Switch account', url, external: true});
     }
-    links.push({name: 'Sign out', url: '/logout'});
+    links.push({name: 'Sign out', id: 'signout', url: '/logout'});
     return links;
   }