Core/Scripts: Fix menu clearing in onGossipSelect()-sections for some scripts (including examples) - patch/fix by Paradox

Closes issue 4524

--HG--
branch : trunk

src/server/scripts/Kalimdor/RazorfenDowns/razorfen_downs.cpp

@@ -54,6 +54,7 @@ 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_TEACHING_GOLDTHORN_TEA, true);