sysutils/bacula13-server: Fix CONFLICTS

bacula13-server should conflict with bacula11-server, not itself.

sysutils/bacula13-server/Makefile

@@ -14,7 +14,7 @@ LICENSE_FILE=	${WRKSRC}/LICENSE
 USES+=		cpe libtool readline shebangfix ssl
 SHEBANG_FILES=	src/cats/make_catalog_backup.pl.in scripts/baculabackupreport.in
 
-CONFLICTS?=	bacula13-server bacula9-server bacula-server
+CONFLICTS?=	bacula11-server bacula9-server bacula-server
 
 LIB_DEPENDS+=	liblzo2.so:archivers/lzo2