Enable CSSTextAlignLast setting by default

https://bugs.webkit.org/show_bug.cgi?id=241241
<rdar://problem/94313487 >

Reviewed by Alan Bujtas.

All the WPT are on parity with Chrome & Firefox, so this should be ready to ship.

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

Canonical link: https://commits.webkit.org/251540@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@295535 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Source/WTF/Scripts/Preferences/WebPreferencesExperimental.yaml

@@ -411,11 +411,11 @@ CSSTextAlignLastEnabled:
   humanReadableDescription: "Enable the property text-align-last, defined in CSS Text 3"
   defaultValue:
     WebKitLegacy:
-      default: false
+      default: true
     WebKit:
-      default: false
+      default: true
     WebCore:
-      default: false
+      default: true
 
 CSSTextJustifyEnabled:
   type: bool