bmp/bmpsuite/q: Remove EXPECTED_FAIL from 64bpp BMP test

Alx Sarequested to merge
cmyk.student/gimp-test-images:alxsa-bmp64-fix into main

Dependent on GNOME/gimp!1868 (merged) being accepted.

Since GIMP now supports importing 64bpp BMPs, this test should no longer fail.

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