Fix setting keywords in the SSH interface
This was broken in commit
8914a41db938194efc021f842c89d47ff6b522c9 which
refactored the argument parsing. Instead of checking for at least the
set-keywords command and a pkgbase name, we were checking for *exactly*
the command and pkgbase name, leaving no room for keywords...
As a result, while we could clear the keywords, we could not set them.
Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>
Signed-off-by: Lukas Fleischer <lfleischer@archlinux.org>