As we don't reconfigure all shaders without shadows when we disable them
indoors (as it'd probably add a hitch to transitioning in and out) we
need to set up dummy state so the shaders don't do anything illegal.
This hadn't had symptoms for most objects as when indoors, nearly
everything would be drawn first in one of the water RTTs, which had
dummy state to disable shadows already. This wasn't true of the water
plane itself, though, yet somehow it took until just now for anyone to
report that.
This resolves vtastek's issue where the water would be invisible indoors