Disable ContentCapture at runtime when it's disabled by DeviceConfig.

Prior to this change, it would only be disabled on boot.

Test: atest ChildlessActivityTest#testSetContentCaptureFeatureEnabled_disabledByDeviceConfig \
      ChildlessActivityTest#testSetContentCaptureFeatureEnabled_disabledThenReEnabledByDeviceConfig
Test: atest CtsContentCaptureServiceTestCases

Bug: 123931489

Change-Id: I9230574db3ee85ba95951a3d9329c96f4e84a87e