Allow FLI palette chunk to not be first #6626
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Resolves #6624
At the moment, FliImagePlugin only loads the palette if it is the first chunk. While this is the case in our test images, the issue has uploaded images where this is not the case.
I used https://www.fileformat.info/format/fli/egff.htm#FLI-DMYID.3.1 as a reference. The test image was created by using hexeditting to swap the two chunks in existing test image hopper.fli.