runtime(zip): Fix for FreeBSD's unzip command

runtime(zip): Fix for FreeBSD's unzip command

Problem:  Cannot browse zipfiles with the unzip program found
	  on FreeBSD.
Solution: Adjust command arguments.

Unzip found on FreeBSD complain about missing argument with the
zipinfo modifier '-Z -1'. Joining arguments seems to work
for both implementations.

Also change `:sil!` to `:sil` so that error messages are properly
reported (per review of Christian Brabandt).

related: #15411

Signed-off-by: Damien <141588647+xrandomname@users.noreply.github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>