DGDS: Willy Beamish dialog boxes require an additional click to be used

[neuromancer]

I'm using latest scummvm revision (9b999346803c53addf7ab02442cf65d24671334b) to play "The Adventures of Willy Beamish" using the GOG game data. After the introduction, one of the first things the players can do is to select dialog options. In the original implementation, if the player needs to select an option of the dialog, the mouse pointer is visible. However, in ScummVM, the mouse pointer is not immediately visible, and you need to either click somewhere to activate it or use the arrow keys. If the mouse pointer is over some dialog option, you will use that option accidentally.

[mduggan]

In 9a65cabb:

DGDS: Fix Willy Beamish head rendering a bit

The hack to keep the blueprints visible broke other interactions. Add a more
targetted hack to make it work. Also fix willy's head flipping when it shouldn't.
There are still some issues overall with head rendering (lipsync issues) but
it's much better now I think.

This fixes #15821.