Migrate to get{Int,String}ForUser

Reported by the lint CallingSettingsNonUserGetterMethodsDetector.
It is recommended to use the *ForUser variant of these functions to
avoid passing the incorrect user id.

Test: m
Bug: 228774926
Fix: 237603566
Change-Id: I2543be4737a30222284ee75c709419da0d409667
Merged-In: I2543be4737a30222284ee75c709419da0d409667
(cherry picked from commit 5731002f)