Correct lint error when it cannot find api_versions_* module

Also, fixes the error when it cannot find a module containing the
`annotations.zip` file.

Bug: 336993217
Test: change `apiVersionsModule` setting in `lint.go` to refer to
      a non-existent module and then run `m nothing` to see the
      error message correctly lists the module name.
Change-Id: I84a9e241d1c3bedebc26e119bd4b9861664c43c1