[jnc_io_base] fix: IoThreadFlag_Datagram was not properly set
[jnc_io_base] fix: IoThreadFlag_Datagram was not properly set

AsyncIoDevice::open() cleared m_ioThreadFlags

vovkos/jancy,vovkos/jancy,vovkos/jancy,vovkos/jancy,vovkos/jancy