[master] c39800d8b Bring back {Req, Resp, Bereq, Beresp}Unset to varnishtop

[Nils Goroll]

commit c39800d8b6bc5cf81bb96bc165c99fcd5b22fd3a
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Mon Apr 12 17:56:28 2021 +0200

    Bring back {Req,Resp,Bereq,Beresp}Unset to varnishtop
    
    Fixes #3527

diff --git a/include/tbl/vsl_tags_http.h b/include/tbl/vsl_tags_http.h
index 7a0198da6..29d731300 100644
--- a/include/tbl/vsl_tags_http.h
+++ b/include/tbl/vsl_tags_http.h
@@ -83,7 +83,7 @@ SLTH(Header,	HTTP_HDR_FIRST,		1, 1, "header",
 	HEADER_NOTICE
 )
 
-SLTH(Unset,	HTTP_HDR_UNSET,		0, 0, "unset header",
+SLTH(Unset,	HTTP_HDR_UNSET,		1, 1, "unset header",
 	"HTTP header contents.\n\n"
 	"The format is::\n\n"
 	"\t%s: %s\n"