Fix regression in 2.0.4 affecting Xdebug 2

Author: johnstevenson

src/XdebugHandler.php

@@ -723,6 +723,7 @@ private static function setXdebugDetails()
         // See if xdebug.mode is supported in this version
         $iniMode = ini_get('xdebug.mode');
         if ($iniMode === false) {
+            self::$xdebugActive = true;
             return;
         }