R1:53f8ad14fa92

Fix an issue in Owners where a transaction change could show too many effects

Summary:
Fixes T13324. Ref PHI1288. Currently, if you edit an Owners package that has some paths with no trailing slashes (like `README.md`) so their internal names and display names differ (`/README.md` display, vs `/README.md/` internal), the "Show Details" in the transaction log shows the path as re-normalized even if you didn't touch it.

Instead, be more careful about handling display paths vs internal paths.

(This code on…