Renaming spatialnavigation from a .jsm to a .js in a mochitest

toolkit/spatial-navigation/tests/chrome/test_snav.xul

@@ -43,7 +43,7 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=436084
 
 <script class="testbody" type="application/javascript">
 <![CDATA[
-Components.utils.import("resource://gre/modules/spatial-navigation.jsm");
+Components.utils.import("resource://gre/modules/spatial-navigation.js");
 
 function onLoad()
 {