Followup: Fully remove references

[phil-allen-msft]

https://github.com/aspnet/LibraryManager/pull/747 removed some references to Minimatch.dll but left a few behind.

Remove those latent references.

[jimmylewis]

Doh, I assumed that these would've cause errors, but the glob expands to 0 items so there's no build issue. Thanks for catching it and cleaning up.