fix: Don’t trim or lowercase usernames

Since instance usernames aren’t as closely regulated as CM emails, we shouldn’t enforce as much in the UI.

https://harperdb.atlassian.net/browse/STUDIO-420

Author: dawsontoth

src/lib/zod/username.ts

@@ -2,6 +2,4 @@ import { z } from 'zod';
 
 export const zodRequireUsername = z
 	.string()
-	.nonempty({ error: 'Please enter a username.' })
-	.trim()
-	.toLowerCase();
+	.nonempty({ error: 'Please enter a username.' });