Fix definition of android_stubs_current in sdk tests

This change fixes an issue with the definition of the
android_stubs_current (and similar) modules in the sdk tests. They were
incorrectly defined as java_sdk_library_import and not java_import.

Test: m nothing
Bug: 155164730
Change-Id: I4e9bfebdd2ff0a374e12284ccdf5ee5518968969