Resolve "fwDicomIOFilter unit-test fails"

What does this MR do?

It fixes all failing tests of the fwDicomIOFilter test suite

How to test it?

launch fwDicomIOFilterTest

Data

git@git.ircad.fr:Sight/sight-data.git

Additional tests to run

• Works on Windows (Debug)
• Works on Windows (Release)
• Works on Linux (Debug)
• Works on Linus (Release)
• Works on macOS (Debug)
• Works on macOS (Release)

Associated Issues/Merge Requests

• Requires

  • https://git.ircad.fr/conan/conan-dcmtk/merge_requests/1

• Issues

  • Fixes https://git.ircad.fr/Sight/sight/issues/186