Kleopatra: Remove ASCII Armor checkbox for private key export
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Description

When generating a key and selecting export in the end the user is asked about "ASCII Armor"
This is not modern Kleo design where we assume that users do not know what ASCII Armor is.

Solution:
Always ASCII Armor. (I do not see a usecase where this would hurt)
Also a filename should be preselected in this dialog.

Details

Version
master