Auto merge of #23740 - servo:jdm-patch-36, r=ferjm

Load GST videofilter plugins.

The video playback tries to create a videobalance element and can't find it without this plugin.

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/23740)
<!-- Reviewable:end -->

components/servo/lib.rs

@@ -157,6 +157,7 @@ mod media_platform {
             "gsttheora.dll",
             "gsttypefindfunctions.dll",
             "gstvideoconvert.dll",
+            "gstvideofilter.dll",
             "gstvideoparsersbad.dll",
             "gstvideoscale.dll",
             "gstvolume.dll",