get rid of EXV_CALL_MEMBER_FN

[neheb]

std::invoke can be used.

ping @kevinbackhouse

[ghost]

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[codecov]

Codecov Report

Merging #2555 (404d247) into main (513b0e8) will increase coverage by 0.01%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main    #2555      +/-   ##
==========================================
+ Coverage   63.90%   63.91%   +0.01%     
==========================================
  Files         103      103              
  Lines       22398    22396       -2     
  Branches    10830    10826       -4     
==========================================
+ Hits        14314    14315       +1     
  Misses       5863     5863              
+ Partials     2221     2218       -3     

Impacted Files	Coverage Δ
include/exiv2/types.hpp	82.85% <ø> (ø)
src/tiffvisitor_int.cpp	80.83% <25.00%> (+0.07%)	⬆️
src/convert.cpp	52.50% <100.00%> (+0.29%)	⬆️

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