ref(base/connection/actions.native): JitsiConnection.connect returns void

Do not return anything from JitsiConnection.connect, because it's not
a promise and returns void. Doing so is confusing to the reader.

react/features/base/connection/actions.native.js

             JitsiConnectionEvents.CONNECTION_FAILED,
             _onConnectionFailed);
 
-        return connection.connect({
+        connection.connect({
             id,
             password
         });