core: Fix identify for armored detached sigs
core: Fix identify for armored detached sigs

* src/data-identify.c (basic_detection): Return signature for
signature.

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This causes identify to return signature for both binary and
ascii armored detached signatures where previously it would
have returned signed for armored signatures and signature for
binary signatures.

GnuPG-Bug-Id: 2314

gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme