tests: disable test-audit-path.t with simple store
The simple store is using a primitive filename encoding scheme.
Many tests in this file fail. So let's disable it for now.
At some point, we should support a mode where we can run tests
without fnstore or dotencode and have all tests assuming use of
these filename encoding mechanisms be conditional on their usage.
Differential Revision: https://phab.mercurial-scm.org/D3101