Replaced deprecated button for create commit

app/assets/javascripts/diffs/components/no_changes.vue

 <script>
 import { mapGetters } from 'vuex';
 import { escape } from 'lodash';
-import { GlDeprecatedButton } from '@gitlab/ui';
+import { GlButton } from '@gitlab/ui';
 import { __, sprintf } from '~/locale';
 
 export default {
   components: {
-    GlDeprecatedButton,
+    GlButton,
   },
   props: {
     changesEmptyStateIllustration: {
@@ -43,9 +43,9 @@ export default {
       <div class="text-content text-center">
         <span v-html="emptyStateText"></span>
         <div class="text-center">
-          <gl-deprecated-button :href="getNoteableData.new_blob_path" variant="success">{{
+          <gl-button :href="getNoteableData.new_blob_path" variant="success" category="primary">{{
             __('Create commit')
-          }}</gl-deprecated-button>
+          }}</gl-button>
         </div>
       </div>
     </div>

spec/frontend/diffs/components/no_changes_spec.js

@@ -2,6 +2,7 @@ import { createLocalVue, shallowMount } from '@vue/test-utils';
 import Vuex from 'vuex';
 import { createStore } from '~/mr_notes/stores';
 import NoChanges from '~/diffs/components/no_changes.vue';
+import { GlButton } from '@gitlab/ui';
 
 describe('Diff no changes empty state', () => {
   let vm;
@@ -37,4 +38,11 @@ describe('Diff no changes empty state', () => {
 
     expect(vm.contains('script')).toBe(false);
   });
+
+  describe('Renders', () => {
+    it('Show create commit button', () => {
+      createComponent();
+      expect(vm.find(GlButton).exists()).toBe(true);
+    });
+  });
 });