Fix misc exiv2 app bugs

[postscript-dev]

1. (See 1. in Problems with --insert and --extract in exiv2 app #1934)

[codecov]

Codecov Report

Merging #2425 (91e7f9c) into main (861625c) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #2425      +/-   ##
==========================================
- Coverage   64.54%   64.53%   -0.01%     
==========================================
  Files         119      119              
  Lines       21112    21112              
  Branches    10420    10420              
==========================================
- Hits        13626    13625       -1     
  Misses       5324     5324              
- Partials     2162     2163       +1     

Impacted Files	Coverage Δ
app/actions.cpp	67.10% <0.00%> (-0.09%)	⬇️

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