CLASSROOMIO-T-42: Limit subdomain names available to organizations

Co-authored-by: Rotimi Best <rotimiibitoyeemma@gmail.com>

Merge-request: CLASSROOMIO-MR-9
Merged-by: Digdippa Team <digdippa@gmail.com>

src/utils/functions/app.js

@@ -2,6 +2,6 @@ export function toggleBodyByTheme(isDark) {
   if (isDark) {
     document.body.className = document.body.className.concat(' ', 'dark');
   } else {
-    document.body.className = document.body.className.replace('dark', '');
+    document.body.className = document.body.className.replace(' dark', '');
   }
 }