Don't let the attract timer hijack an in-flight menu fade (#723)

Pressing start on the splash screen in the last moments before the demo
timeout could play the enter chime and then drop into the demo reel with
no music: the attract timer (gMenuTimingCounter >= 0x12D) fired while the
press-start fade was in flight and overwrote gMenuFadeType to the demo
value, so the fade completed as a demo entry. Vanilla bug; roughly a
0.7-second window every attract cycle.

Only arm the demo when no fade is in flight. A natural timeout (idle, no
fade running) behaves exactly as before.

Play-verified: start pressed repeatedly around the timeout boundary always
lands in the main menu with music; the demo reel still plays when idle.

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