There's a closed pull request on the void-packages repository

imhex: use gtk file picker by default
https://github.com/void-linux/void-packages/pull/45054

Description:
Some xdg-desktop-portal environments dont support a file picker (eg wlroots based ones), so use gtk file picker by default.

See also https://github.com/WerWolv/ImHex/issues/882#issuecomment-1382268291

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#### Testing the changes
- I tested the changes in this PR: **NO**