PSY test fails when PSB cache is not empty

[GabrielKS]

The fix to #1160 introduced this test:

PowerSystems.jl/test/test_parse_psse.jl

Line 49 in 92c7f27

@test parse(Int, get_name(lz_new)) == 3 * parse(Int, get_name(lz_original))

that fails when the relevant system is already in the PSB cache. This therefore doesn't impact the CI but is an annoyance during local development, as all other tests work fine when the PSB cache is not empty. I'm sure it's an easy fix, I'll do it at some point.