commands: fix checking of share safe requirement on `config --shared`
The `if requirements.SHARESAFE_REQUIREMENT in ...` was wrongly placed inside
another if statement which made the check unreachable.
Differential Revision: https://phab.mercurial-scm.org/D9360
$ echo "[extensions]" >> $HGRCPATH
$ echo "mq=" >> $HGRCPATH
$ hg init
$ echo 'base' > base
$ hg ci -Ambase
adding base
$ hg qnew -mmqbase mqbase
$ hg qsave
$ hg qrestore 2
restoring status: hg patches saved state