CI: Installer: Prevent 404 errors on IIS for COPYING file in iframe (#2…

…).

git-svn-id: file:///Users/Shitiz/Downloads/lssvn/source/limesurvey_ci@11267 b72ed6b6-b9f8-46b5-92b4-906544132732

application/controllers/installer.php

@@ -800,7 +800,7 @@ function optional()
      */
     public function license()
     {
-        $filename = base_url(). 'COPYING';
+        $filename = dirname(BASEPATH) . '/COPYING';
         header('Content-Type: text/plain;');
         readfile($filename);
         exit;