Lower case token type check

Improve compatibility with ORCID by checking the response case-insensitively.

Co-authored-by: jeffersoncasimir <15801528+jeffersoncasimir@users.noreply.github.com>

modules/oidc/php/callback.class.inc

@@ -221,7 +221,7 @@ class Callback extends \NDB_Page
         }
         // We don't actually care about this but it implies that something
         // went wrong.
-        if ($respjson['token_type'] !== 'Bearer') {
+        if (strtolower($respjson['token_type']) !== 'bearer') {
             return null;
         }
         if (empty($respjson['access_token'])) {