Merge pull request #14405 from seamuslee001/lab_core_985

#985 Fix trailing slash for urls on Windows

CRM/Utils/System/Base.php

@@ -680,7 +680,7 @@ abstract class CRM_Utils_System_Base {
     }
 
     return [
-      'url' => CRM_Utils_File::addTrailingSlash($userFrameworkResourceURL),
+      'url' => CRM_Utils_File::addTrailingSlash($userFrameworkResourceURL, '/'),
       'path' => CRM_Utils_File::addTrailingSlash($civicrm_root),
     ];
   }