Ares-specific changes to YR NewTheater handling not taken into accord

[Starkku]

Basically in vanilla Yuri's Revenge it is possible to use NewTheater only if the filename starts with one of letters G, C, N or Y. Ares allows use of any letter as the first letter simultaneously with NewTheater.

Currently renderer assumes that the former is the case, even if it might not be. This should be changed.