clang-tidy: remove redundant specifiers

[neheb]

Found with readability-redundant-access-specifiers

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

[codecov]

Codecov Report

Merging #1731 (4fadbdc) into main (4a654e4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1731   +/-   ##
=======================================
  Coverage   66.85%   66.85%           
=======================================
  Files         151      151           
  Lines       20729    20729           
=======================================
  Hits        13858    13858           
  Misses       6871     6871           

Impacted Files	Coverage Δ
include/exiv2/properties.hpp	100.00% <ø> (ø)
include/exiv2/tags.hpp	100.00% <ø> (ø)

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