ftcmd-router-wrapper.sh does not properly support multiple serial ports

Adding more serial ports to the ftcmd-router-wrapper script causes it to parse them incorretly. And the VM doesn't support more than two serial devices either, it seems like adding more serial devices to the libvirt XML causes Windows to be unable to read them. (Code 12 in device manager, unable to allocate resources for this device, or whatever it said) Fortunately, it seems like serial0 can be used as the plain text COM port, and serial1 can be used as the KISS AX.25 COM port used by elveti.