fixing missing / in Drupal embed code

extras/h5p.js

@@ -91,7 +91,7 @@ module.exports = {
                 if (subdir != "") {
                     script_url = script_url+'/'+subdir;
                 }
-                code += ' data-content-id="'+h5pid+'" src="'+script_url+h5pid+'/embed"';
+                code += ' data-content-id="'+h5pid+'" src="'+script_url+'/'+h5pid+'/embed"';
             }
             if (width != "") {
                 code += ' width="'+width+'"';