[EBS] Don't disable location when DISALLOW_CONFIG_LOCATION is set

If *any* user has DISALLOW_CONFIG_LOCATION set, don't disable location
on battery saver.

Test: Manual test with TestDPC
Test:  atest $ANDROID_BUILD_TOP/cts/tests/tests/batterysaving/src/android/os/cts/batterysaving/BatterySaverLocationTest.java

Bug: 73004763
Change-Id: Iea7ddf94703463f0f8f2a92a8e76845b986350c3