Update Negotiate.php

Author: tvdijen

lib/Auth/Source/Negotiate.php

@@ -138,7 +138,7 @@ public function authenticate(array &$state): void
         if (
             $disabled
             || (!empty($_COOKIE['NEGOTIATE_AUTOLOGIN_DISABLE_PERMANENT'])
-                && $_COOKIE['NEGOTIATE_AUTOLOGIN_DISABLE_PERMANENT'] == 'True')
+                && $_COOKIE['NEGOTIATE_AUTOLOGIN_DISABLE_PERMANENT'] === 'true')
         ) {
             Logger::debug('Negotiate - session disabled. falling back');
             $this->fallBack($state);