release: Remove useless ls

Replace "$((ls *.txz))" with "*.txz"

Approved by: re (implicit, release build fixes)
Reported by: jrtc27
Sponsored by: Amazon

(cherry picked from commit e166fea685da4ac6a6891f10b07f98d0e9fcfce3)
(cherry picked from commit ce988aa3e80019566bf5df4cfd73f7b7195756f2)