fixup! refactor: replace <button> with <f-button> in examples (refs SFKUI-7309)

Author: udenius

packages/vue/src/design-component-tests/Button/__screenshots__/Button -- button-group-button-full-width-desktop.png

@@ -118,7 +118,11 @@ export default defineComponent({
             >
                 Discrete Inverted
             </f-button>
-            <f-button class="button-group__item" :mobile-full-width="useFullWidth">
+            <f-button
+                class="button-group__item"
+                :mobile-full-width="useFullWidth"
+                variant="secondary"
+            >
                 Standard
             </f-button>
         </div>