Revert "Use HEAD version of mpv"

This reverts commit 82b33b49734b3470245b6fa95c6d7cece12ceb7c.

.github/workflows/main.yml

@@ -18,8 +18,7 @@ jobs:
     - name: Install dependencies
       run: |
         brew update
-        brew install ninja
-        brew install mpv --HEAD
+        brew install ninja mpv
     - name: Release build
       run: |
         ./download_webclient.sh