Add captcha error to CookieNonceErrorType

Author: ThomazFB

fluxc/src/main/java/org/wordpress/android/fluxc/network/rest/wpapi/Nonce.kt

@@ -22,6 +22,7 @@ sealed interface Nonce {
         CUSTOM_LOGIN_URL,
         CUSTOM_ADMIN_URL,
         INVALID_NONCE,
+        CAPTCHA_ERROR,
         GENERIC_ERROR,
         UNKNOWN
     }