Update Swoole default option

[sy-records]

Reduce the default value of socket_buffer_size

[2021-04-29 17:58:35 @86302.0]	WARNING	set_send_buffer_size(:423): setsockopt(78, SOL_SOCKET, SO_RCVBUF, 134217728) failed, Error: No buffer space available[55]

This problem can occur if the socket_buffer_size option is too large and not accepted by individual systems, although it does not affect the operation of the program.