message: tidy up event handler
diff: @@ -1373,9 +1373,9 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
  ready: true,
  });
  });
  +
  + if (SettingsStore.getValue(UIFeature.Voip)) {
  cli.on('Call.incoming', function(call) {
  - // Check if the VoIP UI has been disabled
  - if (!SettingsStore.getValue(UIFeature.Voip)) return;
  // we dispatch this synchronously to make sure that the event
  // handlers on the call are set up immediately (so that if
  // we get an immediate hangup, we don't get a stuck call)
  @@ -1384,6 +1384,8 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
  call: call,
  }, true);
  });
  + }
  +
  cli.on('Session.logged_out', function(errObj) {
  if (Lifecycle.isLoggingOut()) return;
  