desktop/i3lock: Fixed chown syntax

Signed-off-by: Robby Workman <rworkman@slackbuilds.org>

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

desktop/i3lock/i3lock.SlackBuild

@@ -91,7 +91,7 @@ make install DESTDIR=$PKG
 # i3lock needs setuid to make sure it isn't killed by the kernel and to read shadow.
 # Don't worry, the privileges are dropped really soon after starting
 #   and everything else runs without privileges.
-chown 0.0 $PKG/usr/bin/i3lock
+chown 0:0 $PKG/usr/bin/i3lock
 chmod 4751 $PKG/usr/bin/i3lock
 # We need setuid to set the out of memory score, and drop permissions once done.
 # This makes the program's init slightly more insecure, since we'd only need