Change ModifyInstallerPackageTest to check failure

It is no longer possible to test this functionality as it
requires the INSTALL_PACKAGES permission, which is not grantable
through shell on platform versions below Q.

Bug: 150857253

Test: atest android.appsecurity.cts.AppSecurityTests

Merged-In: Iae070fa225e011f053b9cf61ee4c451e09171e9e
Change-Id: Ib46915b1d1493219aa1c252e08b88b97868dec74
1 file changed