Bug 1910611 - Rename "Moz Button" Storybook story to "Button" r=reusable-components-reviewers,mstriemer

Differential Revision: https://phabricator.services.mozilla.com/D219681

toolkit/content/widgets/moz-button/moz-button.stories.mjs

@@ -6,7 +6,7 @@ import { html, ifDefined } from "../vendor/lit.all.mjs";
 import "./moz-button.mjs";
 
 export default {
-  title: "UI Widgets/Moz Button",
+  title: "UI Widgets/Button",
   component: "moz-button",
   argTypes: {
     l10nId: {