add .git-blame-ignore-revs file and add clang-format commit to it

[hassec]

See github doc for more info

I've also included a fix for the wrong formatting that was merged in #2158

[codecov]

Codecov Report

Merging #2170 (4b76ce2) into main (313842c) will increase coverage by 0.03%.
The diff coverage is 58.73%.

@@            Coverage Diff             @@
##             main    #2170      +/-   ##
==========================================
+ Coverage   63.25%   63.29%   +0.03%     
==========================================
  Files          98       98              
  Lines       19581    19568      -13     
  Branches     9552     9551       -1     
==========================================
- Hits        12386    12385       -1     
+ Misses       5122     5112      -10     
+ Partials     2073     2071       -2     

Impacted Files	Coverage Δ
app/exiv2.cpp	62.54% <0.00%> (+0.06%)	⬆️
include/exiv2/iptc.hpp	100.00% <ø> (ø)
src/basicio.cpp	51.44% <0.00%> (ø)
src/iptc.cpp	63.53% <ø> (ø)
src/jpgimage.cpp	70.74% <ø> (ø)
src/mrwimage.cpp	47.22% <0.00%> (+0.64%)	⬆️
src/tiffcomposite_int.hpp	92.66% <ø> (ø)
src/nikonmn_int.cpp	57.37% <28.57%> (+0.07%)	⬆️
src/preview.cpp	46.75% <31.25%> (ø)
src/minoltamn_int.cpp	55.06% <33.33%> (-0.59%)	⬇️
... and 35 more

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[piponazo]

Thanks for taking care of this 👍