Remove unnecessary default for required properties

app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_auto_merge_enabled.vue

@@ -37,12 +37,10 @@ export default {
     mr: {
       type: Object,
       required: true,
-      default: () => ({}),
     },
     service: {
       type: Object,
       required: true,
-      default: () => ({}),
     },
   },
   data() {

app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_closed.vue

@@ -14,7 +14,6 @@ export default {
     mr: {
       type: Object,
       required: true,
-      default: () => ({}),
     },
   },
 };

app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_conflicts.vue

@@ -45,7 +45,6 @@ export default {
     mr: {
       type: Object,
       required: true,
-      default: () => ({}),
     },
   },
   data() {

app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_failed_to_merge.vue

@@ -17,7 +17,6 @@ export default {
     mr: {
       type: Object,
       required: true,
-      default: () => ({}),
     },
   },
 

app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_merged.vue

@@ -25,12 +25,10 @@ export default {
     mr: {
       type: Object,
       required: true,
-      default: () => ({}),
     },
     service: {
       type: Object,
       required: true,
-      default: () => ({}),
     },
   },
   data() {

app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_merging.vue

@@ -11,7 +11,6 @@ export default {
     mr: {
       type: Object,
       required: true,
-      default: () => ({}),
     },
   },
   data() {