refs.c: Write reflogs for notes just like for branch heads

refs.c: Write reflogs for notes just like for branch heads

The notes code intends to write reflog entries, but currently they are
not written because log_ref_write() checks for the refname path
explicitly.

Add refs/notes to the list of allowed paths so that notes references are
treated just like branch heads, i.e. according to core.logAllRefUpdates
and core.bare.

Signed-off-by: Michael J Gruber <redacted>
Acked-by: Johan Herland <redacted>
Signed-off-by: Junio C Hamano <redacted>