Update deprecated GlIcon size in IDE preview navigator

Changelog: changed

app/assets/javascripts/ide/components/preview/navigator.vue

@@ -117,7 +117,7 @@ export default {
       class="ide-navigator-btn d-flex align-items-center d-transparent border-0 bg-transparent"
       @click="refresh"
     >
-      <gl-icon :size="18" name="retry" use-deprecated-sizes class="m-auto" />
+      <gl-icon :size="16" name="retry" class="m-auto" />
     </button>
     <div class="position-relative w-100 gl-ml-2">
       <input