update.sh: pass -q to git fetch for explicit show_progress=0

update.sh: pass -q to git fetch for explicit show_progress=0

Prior to now the "--quiet" flag has not been passed to git fetch
(nor previously git remote update).

Change that and if show_progress has been explicitly set to "0"
(rather than just being left unset) pass the "-q" option to the
"git fetch" command.

Update projtool.pl to pass show_progress=0 when it's been given the
"--quiet" option as that more closely matches expected behavior.

Signed-off-by: Kyle J. McKay <mackyle@gmail.com>