[iOS] Switch InlineMediaPlaybackRequiresPlaysInlineAttribute to false…

… by default

https://bugs.webkit.org/show_bug.cgi?id=270691
rdar://124264770

Reviewed by Eric Carlson.

We started to add quirks to remove playsinline requirement for some websites.
We can try now to do the reverse as a way to deprecate playsinline.
Set the playsinline requirement to false by default on iOS.

* Source/WTF/Scripts/Preferences/UnifiedWebPreferences.yaml:

Canonical link: https://commits.webkit.org/276029@main

Source/WTF/Scripts/Preferences/UnifiedWebPreferences.yaml

@@ -3374,10 +3374,8 @@ InlineMediaPlaybackRequiresPlaysInlineAttribute:
       "PLATFORM(IOS_FAMILY)": WebKit::defaultInlineMediaPlaybackRequiresPlaysInlineAttribute()
       default: false
     WebKit:
-      "PLATFORM(IOS_FAMILY)": true
       default: false
     WebCore:
-      "PLATFORM(IOS_FAMILY)": true
       default: false
 
 InlinePredictionsInAllEditableElementsEnabled: