Go: Fix test expectations

[owen-mc]

I'm pretty sure this is what happened:

• Go: Fix getType on ImplicitVarArgsSlice #16457 was merged
• Go: fix hasQualifiedName and models-as-data for built-in functions #16458 was merged without rebasing or merging in main
• the combination of the two meant that the test in question can now find paths using the existing taint flow using old-style go function models or value flow using the new-style go MaD models. This leads to extra edges and nodes without any extra results.

This will be fixed when #16413 is merged, which removes the old-style models. (Both of the above PRs were bug-fixes that I pulled out of #16413.)

[atorralba]

LGTM as long as CI passes.