GUI: Introduce a maximum dialog width/height for the options dialogs #3982
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PR #3976 changed the game and global options dialogs so that they are
inside the ScummVM main window, instead of the game list chooser.
We now limit the option dialog width and size, so that there isn't too
much spacing in large resolutions.
This is based on the current theme functionality, as suggested by @sev-
Small resolutions (same as the current dialog):

Large resolutions:
