Refactor initial state: "me" (#5563)

* Refactor initial state: "me"

* remove "me" from reducers/meta.js

app/javascript/mastodon/features/compose/containers/navigation_container.js

@@ -1,9 +1,10 @@
 import { connect }   from 'react-redux';
 import NavigationBar from '../components/navigation_bar';
+import { me } from '../../../initial_state';
 
 const mapStateToProps = state => {
   return {
-    account: state.getIn(['accounts', state.getIn(['meta', 'me'])]),
+    account: state.getIn(['accounts', me]),
   };
 };