Vehicle thermal smoke not preventing missile locks

@JetGunsGoBrrr I tested this and it works 100% of the time in my test server while both moving and stationary against:

Heli A2G missile
Jet A2G missile
IFV AT missile

However, it fails 100% of the time against Sundance Nades which is a bug I believe. Should note as well that if someone fires at close range with any of the weapons above the IR smoke will likely not work as it will be too late to deploy so best practice is to deploy as soon as you see "incoming missile"