security/f-prot: Unbreak after e3847f7

With LICENSE=f-prot and LICENSE_TEXT set the framework creates
${WRKDIR}/f-prot however WRKSRC=${WRKDIR}/f-prot too.  Rename the
license to fix this.

/bin/sh: cannot create /wrkdirs/usr/ports/security/f-prot/work/f-prot: Is a directory

security/f-prot/Makefile

@@ -11,7 +11,7 @@ MAINTAINER=	tdb@FreeBSD.org
 COMMENT=	F-Prot Antivirus for BSD Workstations
 
 # Converted from RESTRICTED
-LICENSE=	f-prot
+LICENSE=	f-prot-license
 LICENSE_NAME=	f-prot
 LICENSE_TEXT=	Free for personal users on personal workstations only
 LICENSE_PERMS=	auto-accept