net/echoping: unbreak final .else path

eugen@ revived this museum piece but it's broken with default options;
the excess backslash I am removing with this commit hides the .else path
in the IDN2/IDN switch.

However, it is not a good idea to keep undead software in the tree though,
and this shows as broken on a poudriere build w/ 14.2-RELEASE amd64.

Reported by:	diizzy@
Approved by:	portmgr@ (blanket just-fix-it approval)

net/echoping/Makefile

@@ -1,6 +1,6 @@
 PORTNAME=	echoping
 PORTVERSION=	6.0.2
-PORTREVISION=	12
+PORTREVISION=	13
 CATEGORIES=	net
 
 MAINTAINER=	eugen@FreeBSD.org
@@ -61,7 +61,7 @@ LIB_DEPENDS+=		libidn2.so:dns/libidn2
 EXTRA_PATCHES+=		${PATCHDIR}/extra-patch-idn2-acinclude.m4 \
 			${PATCHDIR}/extra-patch-idn2-configure.ac \
 			${PATCHDIR}/extra-patch-idn2-echoping.c \
-			${PATCHDIR}/extra-patch-idn2-echoping.h \
+			${PATCHDIR}/extra-patch-idn2-echoping.h
 .else
 CONFIGURE_ARGS+=	--with-libidn=${LOCALBASE}
 LIB_DEPENDS+=		libidn.so:dns/libidn