SCUMM: Special keys are processed even when in an original GUI dialog

[eriktorbjorn]

I was trying to create a savegame in FM Towns Loom using the original save/load dialog, but when I tried to type an upper-case "S" as part of the savefile name I couldn't. Instead it toggled the sound on or off.

This happens in at least:

• The EGA version of Loom
• The FM Towns version of Loom
• The VGA version of Indiana Jones and the Last Crusade

(Good thing at least one of these is still being sold, eh?)

This probably affects other keys as well, but I haven't had the time to investigate.

I'm guessing that it's a simple fix in ScummEngine::processKeyboard() because that's where the "S" key is hard-coded for some games. But I'm already late for work, so that's as far as I got.