fixed a small bug where trie replace didn't always work

--HG--
extra : convert_revision : svn%3A39bc706e-5318-0410-9160-8a85361fbb7c/trunk%401066

core/sm_trie.cpp

@@ -623,7 +623,7 @@ bool sm_trie_add(Trie *trie, const char *key, void *value, bool replace_allowed)
 				/* Do an initial browsing to make sure they're not the same string */
 				if (strcmp(keyptr, term) == 0)
 				{
-					if (!node->valset)
+					if (!node->valset || replace_allowed)
 					{
 						node->valset = true;
 						node->value = value;