gnu: commencement: bash-mesboot0: Break store file-name in comment.

Fixes <https://bugs.gnu.org/43005>.
Reported by Vagrant Cascadian <vagrant@debian.org>.

* gnu/packages/commencement.scm (bash-mesboot0)[arguments]: Break store file
name in comment and add unquoted string-append to silence the
’assert-no-store-file-names’ check.  The store file name check is really meant
for code; this file name was unfortunately used is a comment.