vulkan/gpu_tex: print format as string

To avoid confusion, especially that it was printed as %x without 0x prefix.

approved this merge request

added 2 commits

• 25a23eed - 1 commit from branch videolan:master
• dd16ddf6 - vulkan/gpu_tex: print format as string

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enabled an automatic merge when all merge checks for dd16ddf6 pass

merged