[1.3] Persistent Red Ring On Wireless Modem.

Description:
If the turtle/computer shuts down while a rednet-port is open, then the red ring around the wireless modem remains on.

Even after a reboot and subsequent rednet.close(side) the texture doesn't seem to update and stays red.
Probably because internally the port actually is off and thus trying to turn it off doesn't force the texture to update?
Only after explicitly turning it on first via rednet.open(side) and then closing it rednet.close(side) does the red ring vanish.

Steps to reproduce:

1. Create a turtle or computer with a wireless modem.
2. Start it and execute rednet.open(side) on the modem's side.
3. Shutdown the turtle/computer.

• Observe: Red ring stays on.
• Expected: Red ring should be off.

If this bug report is too formal then I apologize. Just trying to be as clear as possible.
Cheers :(/>/>

Perfect :(/>/> will make sure dan knows about this, glad it's really only a visual bug :)/>/>