Fix looksValid() for games with nested data directories (e.g. Oblivion Remastered)

Some UE5 games have their binary nested under a subdirectory of the Steam
installdir even though the appmanifest points one level up. looksValid()
was checking only for the binary at the game root, causing "does not seem
to contain a game Mod Organizer can manage" when manually browsing.

Add a fallback: if the binary isn't found at root, resolve the game's
%GAME_PATH%-based dataDirectory and check if that path exists. The data
path is unique enough to positively identify the game directory.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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