fix(Core/Movement): Properly updates MOVE_WALK in case of slowing auras. (#7371)

fixed #7301

src/server/game/Entities/Unit/Unit.cpp

@@ -13489,9 +13489,8 @@ void Unit::UpdateSpeed(UnitMoveType mtype, bool forced)
         case MOVE_FLIGHT_BACK:
         case MOVE_RUN_BACK:
         case MOVE_SWIM_BACK:
-            break;
         case MOVE_WALK:
-            return;
+            break;
         case MOVE_RUN:
             {
                 if (IsMounted()) // Use on mount auras

src/server/game/Spells/Auras/SpellAuraEffects.cpp

@@ -3320,6 +3320,7 @@ void AuraEffect::HandleAuraModDecreaseSpeed(AuraApplication const* aurApp, uint8
 
     Unit* target = aurApp->GetTarget();
 
+    target->UpdateSpeed(MOVE_WALK, true);
     target->UpdateSpeed(MOVE_RUN, true);
     target->UpdateSpeed(MOVE_SWIM, true);
     target->UpdateSpeed(MOVE_FLIGHT, true);