Tests: Update to the latest W3C commit that isn't problematic

Ref gh-314

Author: scottgonzalez

package.json

@@ -38,7 +38,7 @@
     "rollup": "^0.29.0"
   },
   "web-platform-tests": {
-    "repo": "w3c/web-platform-tests#c98d1ff0ea91ba1aa9a15e8ea2d70d8ede1fdc0e",
+    "repo": "w3c/web-platform-tests#d12b850c1b6200757e9e19e794d268237c548b14",
     "path": "./tests/w3c"
   },
   "scripts": {

tests/intern.js

@@ -80,6 +80,8 @@ define({
     'tests/functional/pointerevent_pointerup_isprimary_same_as_pointerdown-manual.js',
     'tests/functional/pointerevent_pointerup_pointertype-manual.js',
 
+    // 'tests/functional/pointerevent_properties_mouse-manual.js',
+
     'tests/functional/pointerevent_releasepointercapture_events_to_original_target-manual.js',
     'tests/functional/pointerevent_releasepointercapture_invalid_pointerid-manual.js',