Remove non-functional third remap from hmcar

The haunted mansion cars have an erroneous third remap that doesn't do anything, this remap is only enabled by the invisible cars as they accidentally had the 2nd additional colour flag set rather than the 1st.

objects/rct2/ride/rct2.ride.hmcar.json

@@ -80,7 +80,7 @@
                 "isPoweredRideWithUnrestrictedGravity": true,
                 "hasNoUpstopWheels": true,
                 "hasNoUpstopWheelsBobsleigh": true,
-                "hasAdditionalColour2": true,
+                "hasAdditionalColour1": true,
                 "isPowered": true
             }
         ],