sysutils/restic: Remove BASH and ZSH options

During the last update we forgot to keep %%BASH%% and %%ZSH%% in
pkg-plist and the build currently fails when disabling BASH and/or
ZSH. [1]

Remove the BASH and ZSH options instead of fixing them. Having
options to skip installing tiny completion files does not make much
sense. The current recommendation in the Porter's Handbook is to
always install them unconditionally.

PR: 228551
Reported by: rumble.rubble@gmail.com [1]
Approved by: gregf@hugops.pw (maintainer)
Submitted by: w.schwarzenfeld@utanet.at