misc/nnn: Update to 1.7

Changelog:
https://github.com/jarun/nnn/releases/tag/v1.7

Port changes:

• Shell completion options removed, completions installed unconditionally
• Remove files/patch-nnn.c (merged upstream)

PR: 226253
Submitted by: Dmitri Goutnik <dg@syrec.org> (maintainer)
Approved by: tcberner (mentor, implicit)