wallet_rpc_server: remove detached short payment ids support

src/wallet/wallet_rpc_server.cpp

@@ -691,13 +691,9 @@ namespace tools
       if (wallet2::parse_long_payment_id(payment_id_str, long_payment_id)) {
         cryptonote::set_payment_id_to_tx_extra_nonce(extra_nonce, long_payment_id);
       }
-      /* or short payment ID */
-      else if (wallet2::parse_short_payment_id(payment_id_str, short_payment_id)) {
-        cryptonote::set_encrypted_payment_id_to_tx_extra_nonce(extra_nonce, short_payment_id);
-      }
       else {
         er.code = WALLET_RPC_ERROR_CODE_WRONG_PAYMENT_ID;
-        er.message = "Payment id has invalid format: \"" + payment_id_str + "\", expected 16 or 64 character string";
+        er.message = "Payment id has invalid format: \"" + payment_id_str + "\", expected 64 character string";
         return false;
       }