Fix adattributiond sandbox violation

https://bugs.webkit.org/show_bug.cgi?id=268039
<rdar://119100810>

Reviewed by Per Arne Vollan.

In Bug 263274 we added user-specific DarwinDirectoryDataStore to the adattributiond
sandbox, but neglected the system fallback location. This triggers sandbox telemetry
and prevents the expected fallback behavior.

* Source/WebKit/Resources/SandboxProfiles/ios/com.apple.WebKit.adattributiond.sb.in:

Canonical link: https://commits.webkit.org/273471@main

Source/WebKit/Resources/SandboxProfiles/ios/com.apple.WebKit.adattributiond.sb.in

@@ -160,6 +160,7 @@
 (allow file-read*
     (literal "/dev/urandom")
     (literal "/private/etc/master.passwd")
+    (literal "/System/Library/DarwinDirectory/system/recordStore.data")
     (literal "/private/var/db/DarwinDirectory/local/recordStore.data")
     (subpath "/private/var/preferences/Logging")
     (subpath "/Library/Keychains")