Exact was reachable through the GameDB and the INI only: the desktop and
Big Picture pickers stopped at Full, and cleared fpuExactMode behind
themselves. Both now read and write it with the other three bits, so the
mode can be picked and a config already on it displays as itself.
The Big Picture choice list is sized from its own array. It had taken
the EE array's length for the VU pickers too, which held only while the
two arrays were the same length.