audio/termusic: update to 0.6.18

[v0.6.18] Released on: July 8th, 2022.
New: Add lqueue and tqueue function similar to cmus.
New: include theme files in binary because I saw they are not included in the
      aur package.
New: Fetch invidious instance from website, so that they'll not expire and
      search youtube will always works.
Fix: When playing mp3 encoded by iTunes under gapless mode, symphonia backend
      will panic.

(pin)