fix: call app.GetSaveThumbnail on _WINDOWS64 for world thumbnails

[Patoke]

Description

Allows for saves to show thumbnails when using the 4JLibs project

Implementation

The call for app.GetSaveThumbnail(&pbThumbnailData,&dwThumbnailDataSize); in ConsoleSaveFileOriginal::Flush wasn't triggered as it would only be called on _XBOX and _DURANGO, we added an OR check for _WINDOWS64 too in here

• Implements fix guard from Show actual world names in save list, sorting, preserve level and its name on load/resave #201

[codeHusky]

@Patoke Does this supercede anything in #201? I'm about to merge it

[Patoke]

@codeHusky Most if not the whole implementation in #201 would be redundant with the 4JLibs project, it should be reverted and re-implemented within 4JLibs

[codeHusky]

This PR is dependent on us switching to the community version of 4JLibs and should not be merged until that's ready

[Copilot]

Pull request overview

Updates the save flush logic so world thumbnails are generated and written on Windows 64-bit builds (needed for 4JLibs-based saves), matching behavior already present on Xbox/Durango.

Changes:

• Extends the platform preprocessor guard in ConsoleSaveFileOriginal::Flush() to call app.GetSaveThumbnail() on _WINDOWS64 as well as _XBOX/_DURANGO.

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