Little fix for Vehicle inmunities hack.

Closes issue #2590
We must found a less hacky way to handle this

--HG--
branch : trunk

src/server/game/Entities/Vehicle/Vehicle.cpp

@@ -39,13 +39,15 @@ Vehicle::Vehicle(Unit *unit, VehicleEntry const *vehInfo) : me(unit), m_vehicleI
                     ++m_usableSeatNum;
             }
     }
-    //Set inmunities since db ones are rewritten with player's ones
+    
+    // HACKY WAY, We must found a more generic way to handle this
+    // Set inmunities since db ones are rewritten with player's ones
     switch (GetVehicleInfo()->m_ID)
     {
         case 160:
             me->SetControlled(true, UNIT_STAT_ROOT);
-        case 158:
             me->ApplySpellImmune(0, IMMUNITY_EFFECT, SPELL_EFFECT_KNOCK_BACK, true);
+        case 158:
             me->ApplySpellImmune(0, IMMUNITY_EFFECT, SPELL_EFFECT_HEAL, true);
             me->ApplySpellImmune(0, IMMUNITY_STATE, SPELL_AURA_MOD_FEAR, true);
             me->ApplySpellImmune(0, IMMUNITY_STATE, SPELL_AURA_PERIODIC_HEAL, true);