Add limitAirtimeBonus to spinning cars

This flag is usually used on rides with over the shoulder restraints, so the spinning cars should have them too as they have over the shoulder restraints. I forgot to add this back when I did the majority of the metadata for this object as it just flew under the radar.

Author: ZeeMaji

objects/rct1/ride/rct1.ride.spinning_cars/object.json

@@ -11,6 +11,7 @@
     "properties": {
         "type": "classic_mini_rc",
         "category": "rollercoaster",
+        "limitAirTimeBonus": true,
         "maxCarsPerTrain": 4,
         "ratingMultipler": {
             "excitement": 5,