SCI: QFG1VGA: Dagger game PC lockup and Mac error

[sluicebox]

This for two intertwined bugs in the dagger mini-game that also occur in the original.

The PC version locks up if you use certain inventory items during the dagger game, such as, gasp, a dagger.

The Mac version fixed this by disabling inventory during the game, but the fix introduced a script bug that errors when clicking anywhere during the two second pause at the start of the game:

lookupSelector: Attempt to send to non-object or invalid script. Address 0000:0000, method ::handleEvent (room 340, script 937, localCall ffffffff)!

Attached are PC and Mac saves at the thieves' guid.

To reproduce the PC lockup:

1. Click Do on the board or money on the chief
2. When the game starts, select a dagger from inventory and click it on board

To reproduce the Mac error:

1. Click money on the chief
2. After entering a wager, click anywhere during the two second delay

[sluicebox]

​https://github.com/scummvm/scummvm/pull/1623

[Filippos Karapetis <bluegr@…>]

In f4d836b8:

SCI: Fix QFG1VGA dagger game lockup and error

Fixes a lockup in the PC version and an error in the Mac fix, bug #10958