Do not detect Ultra HDR images as MPO #8056
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Resolves #8052
The Ultra HDR format stores its gain map as an additional MPO image. However, as the issue has found, because we do not support Ultra HDR images, the additional image appears incorrectly.
Instead, this PR treats such files as standard JPEGs.
https://developer.android.com/media/platform/hdr-image-format#signal_of_the_format details how this format can be detected.