Fix for tools/lorisform_parser

Following aces#7446, one of the changes involves
`php/libraries/NullModule.class.inc` that now requires a
`LorisInstance` type parameter.

This fix adds this parameter in the lorisform_parser.php script.

tools/lorisform_parser.php

@@ -55,7 +55,7 @@
     echo "Requiring file...\n";
     include_once $file;
     echo "Instantiating new object...\n";
-    $obj =new $className($lorisInstance, new NullModule(), "", "", "", "");
+    $obj =new $className($lorisInstance, new NullModule($lorisInstance), "", "", "", "");
     echo "Initializing instrument object...\n";
     $obj->setup(null, null);