Fix vector-im/vector-web#694 - Empty invitee list

The invitee list is lazy-loaded 50ms after the first render. We were relying
on setState from the member lazy-load to also kick the invitee list. However,
setState is synchronous and we were loading the invitee list afterwards, which
meant that the SearchableEntityList wouldn't have any invitees until the next
render().

src/components/views/rooms/MemberList.js

@@ -69,11 +69,13 @@ module.exports = React.createClass({
         // Lazy-load in more than the first N members
         setTimeout(function() {
             if (!self.isMounted()) return;
+            // lazy load to prevent it blocking the first render
+            self._loadUserList();
+
             self.setState({
                 members: self.roomMembers()
             });
-            // lazy load to prevent it blocking the first render
-            self._loadUserList();
+            
         }, 50);
 
         // Attach a SINGLE listener for global presence changes then locate the