Trigger a mediascan when downloads get renamed.

Fixes: 132811564
Test: manual
Test: atest --test-mapping packages/providers/MediaProvider
Test: atest DownloadProviderTests
Test: atest cts/tests/app/src/android/app/cts/DownloadManagerTest.java
Test: atest cts/tests/app/DownloadManagerLegacyTest/src/android/app/cts/DownloadManagerLegacyTest.java
Test: atest cts/tests/app/DownloadManagerApi28Test/src/android/app/cts/DownloadManagerApi28Test.java
Change-Id: I319a5b45e703b1eda5846d085c5e1e1e86bbae2b