Fix skottie2movie build

... after https://skia-review.googlesource.com/c/skia/+/285378

(uses the *encoder* component, not the decoder)

TBR=

Change-Id: Icfd48c6f37284e5f3bb8b5d50810ca4d15e3326a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/285383
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
diff --git a/BUILD.gn b/BUILD.gn
index 10584b0..8cd6297 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1811,7 +1811,7 @@
         ":flags",
         ":gpu_tool_utils",
         ":skia",
-        "experimental/ffmpeg:video_decoder",
+        "experimental/ffmpeg:video_encoder",
         "modules/skottie",
         "modules/skottie:utils",
       ]