[0.11.6] Car accelerationperenergymodifier is read-only

[Rahjital]

The accelerationperenergymodifier Lua variable of car entities is read-only despite being read-write in 0.10; the other two car Lua properties (frictionmodifier and consumption modifier) are still read-write, so this seems to be a mistake done when car entities were rewritten for 0.11

[kovarex]

Ok, so I noticed we renamed this to the "effectivitymodifier", but we just forgot to rename the read property, so from 0.11.8 both will be accessed as effectivitymodifier.

Thanks for the notice.