QMimeDatabase::MatchDefault does not work with application/pgp-encrypted files

QMimeDatabase::mimeTypeForFile() by default uses QMimeDatabase::MatchDefault as match mode, but it doesn't work with application/pgp-encrypted files (i.e. gpg ascii-armored files). They are detected as text/plain instead.

The attached test case reproduces the issue (you just need to change one path).