js: fix syntax inside Keyring methods
js: fix syntax inside Keyring methods

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* recent changes in parameter calling led to a forgotten internal call
  in getDefaultKey using old syntax (and failing in case a default key
  is configured)

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