Fix window size change when restoring from minimized state

[stijn-h]

Fixes #37328

When restoring the window (editor or project manager) from a minized state, the window becomes larger. When the window is minimized, window_get_size would return the size as if the window was not minimized. This results in a miscalculation during a WM_MINMAXINFO message here:
L1827: Size2 decor = window_get_size(window_id) - window_get_real_size(window_id);

A simple solution that seems to work fine is to just remove the if statement. If this code is needed, another solution would be to skip the calculation in WM_MINMAXINFO if the window is currently minimized, but it seems like this is the only place the if branch is actually true.

[aaronfranke]

@hinlopen Is this still desired? If so, it needs to be rebased and tested on the latest master branch. While there are no conflicts, rebasing is important so that reviewers can easily test the PR.

[KoBeWi]

The original issue is already fixed. Thanks for the contribution nonetheless.