dirstate-entry: restrict `from_p2` property to tracked file...
dirstate-entry: restrict `from_p2` property to tracked file
The other case is now handled in `from_p2_removed`, and should ideally be moved
to a lower level. So we can drop the `state == 'n'` narrowing and move it in the
property itself.
Differential Revision:
https://phab.mercurial-scm.org/D10959
