Reset Exif rotation flag when copying metadata

[saimn]

Fix #72.

[codecov]

Codecov Report

Merging #422 (130d43e) into main (7bd806b) will increase coverage by 0.50%.
The diff coverage is 92.85%.

❗ Current head 130d43e differs from pull request most recent head cb320b4. Consider uploading reports for the commit cb320b4 to get more accurate results

@@            Coverage Diff             @@
##             main     #422      +/-   ##
==========================================
+ Coverage   86.05%   86.55%   +0.50%     
==========================================
  Files          23       22       -1     
  Lines        1957     1822     -135     
==========================================
- Hits         1684     1577     -107     
+ Misses        273      245      -28     

Impacted Files	Coverage Δ
sigal/image.py	90.51% <90.00%> (-1.15%)	⬇️
sigal/plugins/watermark.py	88.37% <100.00%> (ø)
sigal/utils.py	91.80% <0.00%> (-3.28%)	⬇️
sigal/plugins/nomedia.py	89.74% <0.00%> (-0.51%)	⬇️
sigal/writer.py	84.50% <0.00%> (-0.22%)	⬇️
sigal/video.py	90.75% <0.00%> (-0.16%)	⬇️
sigal/settings.py	97.87% <0.00%> (-0.05%)	⬇️
sigal/log.py	82.75% <0.00%> (ø)
... and 13 more

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