testing/9base: fix troff directory
As is, the troff directory gets placed in the incorrect place due to mkdir already creating the directory. This should fix that behavior, and place it in 9base/lib/troff. Also removes the quotes around pkgname, to resolve the linting error that causes.
hopefully I can at least get this correct, since it seems I'm incapable of doing mail patches aha
old merge request: !28920 (closed)