BUG/MINOR: cfgparse: use the GLOBAL not LISTEN keywords list for spell checking

In commit a0e8eb8ca ("MINOR: cfgparse: suggest correct spelling for
unknown words in global section") we got the ability to locate a better
matching word in case of error. But it mistakenly used the CFG_LISTEN
class of words instead of CFG_GLOBAL, resulting in proposing unsuitable
matches in addition to the long hard-coded list. Now, "tune.dh-param"
correctly proposes "tune.ssl.default-dh-param".

No backport is needed.
diff --git a/src/cfgparse-global.c b/src/cfgparse-global.c
index fc56fbf..72b11c0 100644
--- a/src/cfgparse-global.c
+++ b/src/cfgparse-global.c
@@ -1285,7 +1285,7 @@
 			}
 		}
 		
-		best = cfg_find_best_match(args[0], &cfg_keywords.list, CFG_LISTEN, common_kw_list);
+		best = cfg_find_best_match(args[0], &cfg_keywords.list, CFG_GLOBAL, common_kw_list);
 		if (best)
 			ha_alert("parsing [%s:%d] : unknown keyword '%s' in '%s' section; did you mean '%s' maybe ?\n", file, linenum, args[0], cursection, best);
 		else