Update MrWidgetAuthorTime and MRWidgetMerged spec

spec/javascripts/vue_mr_widget/components/mr_widget_author_time_spec.js

@@ -34,7 +34,7 @@ describe('MrWidgetAuthorTime', () => {
   });
 
   it('renders provided time', () => {
-    expect(vm.$el.querySelector('time').getAttribute('title')).toEqual('2017-03-23T23:02:00.807Z');
+    expect(vm.$el.querySelector('time').getAttribute('data-original-title')).toEqual('2017-03-23T23:02:00.807Z');
     expect(vm.$el.querySelector('time').textContent.trim()).toEqual('12 hours ago');
   });
 });

spec/javascripts/vue_mr_widget/components/states/mr_widget_merged_spec.js

@@ -186,7 +186,7 @@ describe('MRWidgetMerged', () => {
 
   it('should use mergedEvent mergedAt as tooltip title', () => {
     expect(
-      vm.$el.querySelector('time').getAttribute('title'),
+      vm.$el.querySelector('time').getAttribute('data-original-title'),
     ).toBe('Jan 24, 2018 1:02pm GMT+0000');
   });
 });