Revert passing script variables by reference (#16030)

#15578 added the EXTR_REFS flag to the extract() function in modScript::process with the intention of allowing plugins to manipulated variables passed in to it.

Unfortunately per https://community.modx.com/t/spform-how-to-change-language/4917/16 this is causing issues when local variables in a snippet share the name of a script property or a copy of $scriptProperties is made. This is causing wildly unexpected results.

Author: Mark-H

core/src/Revolution/modScript.php

@@ -84,7 +84,7 @@ public function process($properties = null, $content = null)
                 $scriptProperties = $this->xpdo->event->params = $this->_properties; /* store params inside event object */
                 ob_start();
                 unset($properties, $content);
-                extract($scriptProperties, EXTR_SKIP|EXTR_REFS);
+                extract($scriptProperties, EXTR_SKIP);
                 $includeResult = include $this->_scriptFilename;
                 $includeResult = ($includeResult === null ? '' : $includeResult);
                 if (ob_get_length()) {