Refine Wi-Fi privacy settings

- When changing two configurations, the configuration must be refreshed before modifying the second configuration to prevent the first configuration from being rolled back by the old configuration.

Fix: 360313149
Flag: EXEMPT bugfix
Test: Manual testing
atest -c WifiPrivacyPageProviderTest

Change-Id: If0e2c2b6a708fa59929b23409aff1254c6566fef