Fix "location_time_zone_detection_enabled"

Fix "location_time_zone_detection_enabled" user restriction handling.
This setting impacts user privacy so it is not being restricted like
the ability to set the time / time zone manually & change the auto time
/ time zone toggles.

Bug: 166579161
Test: Manual testing with the restriction enabled via TestDPC
Test: atest services/tests/servicestests/src/com/android/server/timezonedetector/ConfigurationInternalTest.java
Test: atest services/tests/servicestests/src/com/android/server/timezonedetector/TimeZoneDetectorStrategyImplTest.java
Change-Id: I07eb49a4aaa3392aefdb733465b27d671b3e227d