Fix AppCLoningMediaProviderHostTest Failures.

Currently, in AppCloningDeviceTest we assert that the DCIM
directory only contains files created by this test.
However, DCIM directory is used by multiple tests and some
do not remove the created files, causing the assertion
'containsOnly' to fail.
We now test the negative case by explicitly stating which
file is not expected to be present.
Reciprocation: http://ab/I62700010091015191

Bug: 246988075
Test: atest
android.scopedstorage.cts.host.AppCloningMediaProviderHostTest

Change-Id: Ie83d72260982b444d72bc49cc0f030ddd7151ba7
2 files changed