Bump Phantoon difficulty for no missiles, charge, screw

[thieman]

Capturing a conversation on the discord with ouiche. Ran into a seed where I have to kill Phantoon with only supers, no missiles charge or screw. Pretty difficult, merits a difficulty bump.

Link from that convo:

RandomMetroidSolver/logic/helpers.py

Line 699 in ad43aa3

elif not hasCharge and sm.itemCount('Missile') <= 2: # few missiles is harder