SCI: SQ6 shuttle cockpit save games fail to load

[sluicebox]

In version 1.0 (which GOG sells) if you save the game in the shuttle cockpit while the cursor is Walk then it can't be loaded from the launcher, and will usually fail to load from within the game.

To reproduce from room 480 inside the shuttle:

1. Click Do on the cockpit seat
2. While walking, right click twice to cycle to the Walk cursor
3. Cockpit loads with Walk cursor
4. Save the game
5. Load game from launcher, kUpdateScreenItem errors

This is a script bug that Sierra fixed in later versions. It was reported as part of #11640 but is separate so I'm breaking it out here to avoid confusion. Attached is a save game that will error when loaded from launcher.

[sluicebox]

Fixed in: d9ffa7b3d7f681c8d2f2929c4878888304bcaa8e

This does not fix existing saved games, they are already corrupt. This prevents the cockpit from initializing with the Walk cursor, preventing the illegal state, which is what Sierra did.