third_party: Reformat shell scripts

shfmt -w -p -i 0 -fn third_party/update.sh
shfmt -w -p -i 0 -fn third_party/waf/update.sh

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Pavel Filipenský <pfilipensky@samba.org>

Autobuild-User(master): Pavel Filipensky <pfilipensky@samba.org>
Autobuild-Date(master): Wed Aug 10 14:14:04 UTC 2022 on sn-devel-184
