BUG: 51d: In Hash Trie, multi header matching was affected by the header names stored globaly.

Some logic around mutli header matching in Hash Trie has been improved
where only the name of the most important header was stored in the
global heade_names structure. Now all headers are stored, so are used in
the mutli header matching correctly.
diff --git a/src/51d.c b/src/51d.c
index 20760d6..a09d139 100644
--- a/src/51d.c
+++ b/src/51d.c
@@ -541,8 +541,8 @@
 	global_51degrees.header_offsets = malloc(global_51degrees.header_count * sizeof(int32_t));
 	for (index = 0; index < global_51degrees.header_count; index++) {
 		global_51degrees.header_offsets[index] = fiftyoneDegreesGetHttpHeaderNameOffset(ds, index);
-		global_51degrees.header_names->area = (char*)fiftyoneDegreesGetHttpHeaderNamePointer(ds, index);
-		global_51degrees.header_names->data = strlen(global_51degrees.header_names->area);
+		global_51degrees.header_names[index].area = (char*)fiftyoneDegreesGetHttpHeaderNamePointer(ds, index);
+		global_51degrees.header_names[index].data = strlen(global_51degrees.header_names[index].area);
 		global_51degrees.header_names[index].size = global_51degrees.header_names->data;
 	}
 }