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Parse Exif flash tag more correctly

Ratchanan Srirattanamet requested to merge peat-psuwit/camera-app:fix-exif-flash into master

Previously, the code assumed that every value other than 0 is "flash on" which is incorrect. This commit makes the code parse the value correctly, treating the value as a bitfield and retrieve flash firing status from it.

[1] https://www.awaresystems.be/imaging/tiff/tifftags/privateifd/exif/flash.html

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