[Android] Removed Privacy Sandbox setting

Chromium change:
https://github.com/chromium/chromium/commit/2b22615d215b346d8751d508fbabbd5a923046fe

CL removes the flag controlling the first release of the Privacy
Sandbox settings, solidifying the feature as launched.

Bug: 1174572

android/java/org/chromium/chrome/browser/privacy/settings/BravePrivacySettings.java

@@ -219,6 +219,7 @@ public class BravePrivacySettings extends PrivacySettings {
         removePreferenceIfPresent(PREF_AD_BLOCK);
         removePreferenceIfPresent(PREF_SYNC_AND_SERVICES_LINK);
         removePreferenceIfPresent(PREF_NETWORK_PREDICTIONS);
+        removePreferenceIfPresent(PREF_PRIVACY_SANDBOX);
 
         updatePreferences();
     }