Change default for guest access

Room status could not be loaded on time to decide if guests are allowed

Change-Id: I40984d8fef7a162b2f76cb99ef17a57a01b6ca64

Author: awesome-michael

src/components/structures/RoomView.js

@@ -131,7 +131,7 @@ export default createReactClass({
             searching: false,
             searchResults: null,
             callState: null,
-            guestsCanJoin: false,
+            guestsCanJoin: true,
             canPeek: false,
             showApps: false,
             isAlone: false,