installer/mklive: make sure to install dcron rather than cronie.

dcron is smaller and only has a libc dependency.

cronie is selected because it appears alphabetically before in the repo index.

installer.sh.in

@@ -757,7 +757,7 @@ install_packages() {
     mkdir -p $TARGETDIR/var/db/xbps/keys
     cp /var/db/xbps/keys/*.plist $TARGETDIR/var/db/xbps/keys
     mkdir -p $TARGETDIR/boot/grub
-    stdbuf -oL xbps-install  -r $TARGETDIR -Sy base-system ${_grub} 2>&1 | \
+    stdbuf -oL xbps-install  -r $TARGETDIR -Sy dcron base-system ${_grub} 2>&1 | \
         DIALOG --title "Installing base system packages..." \
         --programbox 24 80
     if [ $? -ne 0 ]; then