CSSConfig: Fetch accounts from config

gajim/gtk/css_config.py

@@ -534,7 +534,7 @@ def _invalidate_cache(self):
 
     def refresh(self):
         css = ''
-        accounts = app.get_accounts_sorted()
+        accounts = app.config.get_per('accounts')
         for index, account in enumerate(accounts):
             color = app.config.get_per('accounts', account, 'account_color')
             css_class = 'gajim_class_%s' % index