Unreviewed, reverting 276373@main.

https://bugs.webkit.org/show_bug.cgi?id=271326

exposed issues with rendering captions

Reverted changeset:

"[visionOS] Enable Linear Media Player by default"
https://bugs.webkit.org/show_bug.cgi?id=271172
https://commits.webkit.org/276373@main

Canonical link: https://commits.webkit.org/276410@main

Source/WTF/Scripts/Preferences/UnifiedWebPreferences.yaml

@@ -3725,7 +3725,7 @@ LegacyOverflowScrollingTouchEnabled:
 
 LinearMediaPlayerEnabled:
   type: bool
-  status: internal
+  status: unstable
   category: media
   humanReadableName: "Linear Media Player"
   humanReadableDescription: "Enable LinearMediaPlayer for fullscreen video"
@@ -3734,7 +3734,7 @@ LinearMediaPlayerEnabled:
     WebKitLegacy:
       default: false
     WebKit:
-      default: true
+      default: false
     WebCore:
       default: false