Check if embedded RAF image is really a TIFF (backport #1796)

[mergify]

This is an automatic backport of pull request #1796 done by Mergify.

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[codecov]

Codecov Report

Merging #1851 (8875fcd) into main (cca3e07) will increase coverage by 0.08%.
The diff coverage is 75.00%.

❗ Current head 8875fcd differs from pull request most recent head be7f276. Consider uploading reports for the commit be7f276 to get more accurate results

@@            Coverage Diff             @@
##             main    #1851      +/-   ##
==========================================
+ Coverage   60.62%   60.70%   +0.08%     
==========================================
  Files          96       96              
  Lines       18873    18877       +4     
  Branches     9487     9491       +4     
==========================================
+ Hits        11441    11460      +19     
+ Misses       5144     5124      -20     
- Partials     2288     2293       +5     

Impacted Files	Coverage Δ
src/rafimage.cpp	20.73% <75.00%> (+7.59%)	⬆️
src/tiffimage_int.cpp	79.55% <0.00%> (+1.10%)	⬆️

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