Core: Blood Furnace - Broggok event

Move prisoners back in cages after respawn. They didn't reset correctly
for players which were still in the instance after wipe

src/server/scripts/Outland/HellfireCitadel/BloodFurnace/instance_blood_furnace.cpp

@@ -316,6 +316,7 @@ class instance_blood_furnace : public InstanceMapScript
                 if (!prisoner->isAlive())
                     prisoner->Respawn(true);
                 prisoner->SetFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_IMMUNE_TO_PC | UNIT_FLAG_IMMUNE_TO_NPC | UNIT_FLAG_NON_ATTACKABLE);
+                prisoner->GetMotionMaster()->MoveTargetedHome();
             }
 
             void StorePrisoner(Creature* creature)