fix mobile admin bar overflow

Author: cedric07

src/scss/04-utilities/_wp-admin-bar.scss

@@ -0,0 +1,5 @@
+#wpadminbar {
+    @include breakpoints(sm, max) {
+        overflow: hidden;
+    }
+}

src/scss/04-utilities/utilities.scss

@@ -1,3 +1,4 @@
+@import "./wp-admin-bar";
 @import "./focus";
 @import "./lazyload";
 @import "./seo";