REGTESTS: revert workaround for a crash with recent libressl on http-reuse sni

LibreSSL-3.2.5 has fixed "use-after-free" in tls session resumption,
let us enable session resumption back
diff --git a/reg-tests/connection/http_reuse_conn_hash.vtc b/reg-tests/connection/http_reuse_conn_hash.vtc
index 81d16f9..991e86f 100644
--- a/reg-tests/connection/http_reuse_conn_hash.vtc
+++ b/reg-tests/connection/http_reuse_conn_hash.vtc
@@ -9,11 +9,9 @@
 		mode http
 
 	# sni
-	# ssl-reuse is disabled because it seems to be the origin of a crash with
-	# libressl from 3.2.2 on the CI (cf github issue #1115)
 	listen sender-sni
 		bind "fd@${feS_sni}"
-		server srv2 ${h1_feR_ssl_addr}:${h1_feR_ssl_port} ssl sni "req.hdr(x-sni)" verify none pool-low-conn 2 no-ssl-reuse
+		server srv2 ${h1_feR_ssl_addr}:${h1_feR_ssl_port} ssl sni "req.hdr(x-sni)" verify none pool-low-conn 2
 
 	# set-dst
 	# specify dst1_addr for server, which should be identical to dst2_addr