Fixed content capture whitelist for specific activities.

Test: manual verification (it cannot be fully verified using the current CTS setup)
Test: atest CtsContentCaptureServiceTestCases:android.contentcaptureservice.cts.WhitelistTest
Test: atest FrameworksCoreTests:android.content.ContentCaptureOptionsTest
Test: atest CtsContentCaptureServiceTestCases # sanity check
Test: m update-api

Fixes: 130573023
Merged-In: I2c76a01bd98c4154c4c59099f1368232d2dba80d
Change-Id: I2c76a01bd98c4154c4c59099f1368232d2dba80d