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/Karazhan/bosses_opera.cpp

@@ -778,6 +778,7 @@ public:
 
     bool OnGossipSelect(Player* pPlayer, Creature* pCreature, uint32 /*uiSender*/, uint32 uiAction)
     {
+        pPlayer->PlayerTalkClass->ClearMenus();
         if (uiAction == GOSSIP_ACTION_INFO_DEF)
         {
             if (Creature* pBigBadWolf = pCreature->SummonCreature(CREATURE_BIG_BAD_WOLF, 0.0f, 0.0f, 0.0f, 0.0f, TEMPSUMMON_TIMED_OR_DEAD_DESPAWN, HOUR*2*IN_MILLISECONDS))

src/server/scripts/EasternKingdoms/Karazhan/karazhan.cpp

@@ -326,6 +326,7 @@ public:
 
     bool OnGossipSelect(Player* pPlayer, Creature* pCreature, uint32 /*uiSender*/, uint32 uiAction)
     {
+        pPlayer->PlayerTalkClass->ClearMenus();
         npc_barnesAI* pBarnesAI = CAST_AI(npc_barnes::npc_barnesAI, pCreature->AI());
 
         switch(uiAction)
@@ -417,6 +418,7 @@ public:
 
     bool OnGossipSelect(Player* pPlayer, Creature* /*pCreature*/, uint32 /*uiSender*/, uint32 uiAction)
     {
+        pPlayer->PlayerTalkClass->ClearMenus();
         if (uiAction == GOSSIP_ACTION_INFO_DEF + 1)
             pPlayer->CastSpell(pPlayer, SPELL_TELEPORT, true);