Update mr_widget_options_spec.js

spec/javascripts/vue_mr_widget/mr_widget_options_spec.js

 import Vue from 'vue';
-import MRWidgetService from '~/vue_merge_request_widget/services/mr_widget_service';
 import mrWidgetOptions from '~/vue_merge_request_widget/mr_widget_options';
 import eventHub from '~/vue_merge_request_widget/event_hub';
 import notify from '~/lib/utils/notify';