fix: use permalink and remove license mention again

Co-authored-by: ReenigneArcher <[email protected]>

Contents/Resources/web/templates/login.html

@@ -1,5 +1,4 @@
-{# Code from https://github.com/Tautulli/Tautulli/blob/master/data/interfaces/default/login.html. #}
-{# Licensed under the GNU General Public License v3 (GPLv3) #}
+{# Reference: https://github.com/Tautulli/Tautulli/blob/d019efcf911b4806618761c2da48bab7d04031ec/data/interfaces/default/login.html #}
 
 {% extends 'base.html' %}
 {% block modals %}