Ben Wiederhake 3084291625 LibGUI: Fix crash when previewing palette images ...

For example, navigating File Manager to a directory that contains a vaild BMP file that
uses a palette, this code would end up trying to create an indexed thumbnail.
However, Painter asserts that the thumbnail that we paint on is *not* indexed,
usually crashing File Manager.

Partially fixes #5299, as it now crashes somewhere else.

2021-02-21 22:34:09 +01:00

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