vndk-def: Fix vndk-indirect computation bug

This commit replaces a vndk_indirect with vndk because we are computing
the indirect dependencies of vndk (i.e. closure(vndk) - vndk).

Bug: 37867089
Test: vndk-indirect libs are printed with sailfish images.
Change-Id: I218333c7dbb2a372cc9d170f34674510cc01aa0e