fix C++20 deprecation warning

[neheb]

Capturing this with = is deprecated.

Signed-off-by: Rosen Penev [email protected]

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Legend

[codecov]

Codecov Report

Merging #2476 (7fd8233) into main (ed67372) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2476   +/-   ##
=======================================
  Coverage   62.08%   62.08%           
=======================================
  Files         121      121           
  Lines       22830    22830           
  Branches    11212    11212           
=======================================
  Hits        14175    14175           
  Misses       6448     6448           
  Partials     2207     2207           

Impacted Files	Coverage Δ
src/bmffimage.cpp	73.21% <100.00%> (ø)

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