p910nd: init: partial fix for openwrt/packages#10496

Harmless to carry this fix until procd.sh adds the param

This parameter will mean umdns advertises not just "OpenWrt" but a more
appropriate string:

"Apple LaserWriter Pro 630"

Signed-off-by: Paul Donald <newtwen@gmail.com>

net/p910nd/files/p910nd.init

@@ -83,7 +83,7 @@ start_p910nd() {
 			[ -n "$mdns_ver" ] && set -- "$@" "usb_VER=$mdns_ver"
 
 			# Call procd_add_mdns with the positional parameters
-			procd_add_mdns "$@"
+			MDNS_INSTANCE_NAME="$mdns_ty" procd_add_mdns "$@"
 		fi
 		procd_close_instance
 	fi