Mime type consistency

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/NfcHelper.java

@@ -98,7 +98,7 @@ public class NfcHelper {
                      * guarantee that this activity starts when receiving a beamed message. For now, this code
                      * uses the tag dispatch system.
                      */
-                    return new NdefMessage(NdefRecord.createMime(Constants.NFC_MIME,
+                    return new NdefMessage(NdefRecord.createMime(Constants.MIME_TYPE_KEYS,
                             mNfcKeyringBytes), NdefRecord.createApplicationRecord(Constants.PACKAGE_NAME));
                 }
             };