Cleanup test code from AdminX

refs. https://github.com/TryGhost/Team/issues/3351

ghost/admin-x-settings/src/App.tsx

@@ -6,32 +6,17 @@ import Settings from './components/Settings';
 import Sidebar from './components/Sidebar';
 import {ServicesProvider} from './components/providers/ServiceProvider';
 import {Toaster} from 'react-hot-toast';
-import {showToast} from './admin-x-ds/global/Toast';
 
 interface AppProps {
     ghostVersion: string;
 }
 
 function App({ghostVersion}: AppProps) {
-    // const notify = () => toast.success('Here is your toast.', {
-    //     duration: 10000000,
-    //     position: 'bottom-left'
-    // });
-
-    const notify = () => showToast({
-        message: 'Hello toast',
-        options: {
-            duration: 1000000,
-            position: 'bottom-left'
-        }
-    });
-
     return (
         <ServicesProvider ghostVersion={ghostVersion}>
             <DataProvider>
                 <div className="admin-x-settings">
                     <Toaster />
-                    <button type='button' onClick={notify}>Make me a toast</button>
                     <NiceModal.Provider>
                         <div className='fixed left-6 top-4'>
                             <Button label='&larr; Done' link={true} onClick={() => window.history.back()} />