correct dark mode credit url

assets/theme.js

-// credit AdminLTE, original code here: https://github.com/ColorlibHQ/AdminLTE/blob/master/docs/_includes/foot.html
+// credit AdminLTE, original code with css here: https://github.com/ColorlibHQ/AdminLTE/commit/e7ed74d4eae67cf00d6b1be6cbbe5f43e551c7b6
 
 var toggleSwitch = document.querySelector('.theme-switch input[type="checkbox"]');
 var currentTheme = localStorage.getItem('theme');