Change stimulants TC cost to 6

[Studenterhue]

In addition to the PR ZeWaka and Carbadox linked that raises the cost of stimulants like the thread title proposes, there is also a PR that makes morphine reduce duration of stimulants too, at half the effectiveness of haloperidol. Based on some quick back-of-the-napkin calculations, you'd need about 15 units of morphine to end the full 4 mins of stims, probably less since the effect lowers on its own and since there's probably gonna be some amount of time since the stims being administered and you encountering the drugged up psycho. As its description points out, this gives an extra counter for stimulants also indirectly makes the morphine auto-injectors from the Security loadout vendor stronger.