Fixes gossip scripts or points of interests of npc's with a Scriptname assigned to them.

This fixes guards in Major cities.
Thanks to Aokromes for testing.
Thanks to click for converting all the scripts to work with this change.

--HG--
branch : trunk

src/server/scripts/EasternKingdoms/eastern_plaguelands.cpp

@@ -75,6 +75,7 @@ public:
 
     bool OnGossipSelect(Player* pPlayer, Creature* pCreature, uint32 /*uiSender*/, uint32 uiAction)
     {
+        pPlayer->PlayerTalkClass->ClearMenus();
         if (uiAction == GOSSIP_ACTION_TRADE)
             pPlayer->SEND_VENDORLIST(pCreature->GetGUID());
         return true;
@@ -152,6 +153,7 @@ public:
 
     bool OnGossipSelect(Player* pPlayer, Creature* pCreature, uint32 /*uiSender*/, uint32 uiAction)
     {
+        pPlayer->PlayerTalkClass->ClearMenus();
         switch (uiAction)
         {
             case GOSSIP_ACTION_INFO_DEF+1: