[Glitch] Use Immutable Record for accounts in Redux state

Port 3bf2a7296e to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/features/compose/components/navigation_bar.jsx

@@ -15,7 +15,7 @@ import ActionBar from './action_bar';
 export default class NavigationBar extends ImmutablePureComponent {
 
   static propTypes = {
-    account: ImmutablePropTypes.map.isRequired,
+    account: ImmutablePropTypes.record.isRequired,
     onLogout: PropTypes.func.isRequired,
     onClose: PropTypes.func,
   };