Core: Remove some no longer needed gossip code.

src/server/game/Entities/Object/Object.cpp

@@ -579,12 +579,6 @@ void Object::_BuildValuesUpdate(uint8 updateType, ByteBuffer* data, UpdateMask*
                     {
                         if (!target->canSeeSpellClickOn(this->ToCreature()))
                             appendValue &= ~UNIT_NPC_FLAG_SPELLCLICK;
-
-                        if (appendValue & UNIT_NPC_FLAG_TRAINER)
-                        {
-                            if (!creature->isCanTrainingOf(target, false))
-                                appendValue &= ~(UNIT_NPC_FLAG_TRAINER | UNIT_NPC_FLAG_TRAINER_CLASS | UNIT_NPC_FLAG_TRAINER_PROFESSION);
-                        }
                     }
 
                     *data << uint32(appendValue);