fix(inotify): correct event type for symlinks

[DanielCodesphere]

Use the correct path type for symlinks instead of always using file.
This might have to be fixed for other backends as well, but i didn't test that.

[e-dant]

Thank you, this looks great!

Some (trivial, non-blocking) notes which I can play with in next:

• pathof is relatively expensive, since paths can be large, and it performs a hash. Cutting that down to (usually) once per path in the body of the function would be nice.
• The null checks on in can be avoided, since they are made by the caller do_ev_recv.