print/cups-filters: cups-browsed: disable cups protocol

Disable the cups-browsed cups protocol.  This reduces the attack
surface but does NOT fix the recently discovered remote code execution
vulnerability in cups-browsed.

Derived from https://github.com/OpenPrinting/cups-browsed/commit/1debe6b140c3

print/cups-filters/Makefile

 PORTNAME=	cups-filters
 PORTVERSION=	1.28.17
-PORTREVISION=	4
+PORTREVISION=	5
 CATEGORIES=	print
 MASTER_SITES=	https://github.com/OpenPrinting/cups-filters/releases/download/${DISTVERSION}/
 
@@ -100,8 +100,8 @@ POPPLER_LIB_DEPENDS=		libpoppler-cpp.so:graphics/poppler
 CUPS_BROWSED_DESC=		cups-browsed(8) options
 
 AVAHI_CONFIGURE_ENABLE=		avahi
-AVAHI_CONFIGURE_OFF=		--with-browseremoteprotocols=cups
-AVAHI_CONFIGURE_ON=		--with-browseremoteprotocols="dnssd cups"
+AVAHI_CONFIGURE_OFF=		--with-browseremoteprotocols=none
+AVAHI_CONFIGURE_ON=		--with-browseremoteprotocols=dnssd
 AVAHI_DESC=			Discover Zeroconf/Bonjour network printers
 AVAHI_LIB_DEPENDS=		libavahi-client.so:net/avahi-app
 AVAHI_SUB_LIST=			AVAHI_DAEMON=avahi_daemon