requestUnblurScreen(id) {
    if (id != null) {
      const indexOf = _.lastIndexOf(this._blurScreenRequests, id);
      if (indexOf !== -1) {
        const numRequests = this._blurScreenRequests.length;
        this._blurScreenRequests.splice(indexOf, 1);
        if (numRequests === 1 && this._blurScreenRequests.length === 0) {
          this.getEventBus().trigger(EVENTS.blur_screen_stop, { type: EVENTS.blur_screen_stop });
        }
      }
    } else {
      Logger.module('ENGINE').error('FX.requestUnblurScreen -> requires id');
    }
  }
Request unblur of entire screen. Will only stop blur when this is last request.
@param {String|Number|Integer} id