CLEANUP: quic: Remove the useless directive "tune.quic.backend.max-idle-timeou"

First there is a typo in the directive name, then it is not documented and
finally, it is not used at all. The directive is only removed from the
keyword list. Parsing function is not updated.

This patch should fix the issue #2601.

Author: capflam

src/cfgparse-quic.c

@@ -370,7 +370,6 @@ static int cfg_parse_quic_tune_on_off(char **args, int section_type, struct prox
 
 static struct cfg_kw_list cfg_kws = {ILH, {
 	{ CFG_GLOBAL, "tune.quic.socket-owner", cfg_parse_quic_tune_socket_owner },
-	{ CFG_GLOBAL, "tune.quic.backend.max-idle-timeou", cfg_parse_quic_time },
 	{ CFG_GLOBAL, "tune.quic.cc-hystart", cfg_parse_quic_tune_on_off },
 	{ CFG_GLOBAL, "tune.quic.cc.cubic.min-losses", cfg_parse_quic_tune_setting },
 	{ CFG_GLOBAL, "tune.quic.frontend.conn-tx-buffers.limit", cfg_parse_quic_tune_setting },