[Dx4win] PSK31 bug

[Mel]

This is actually carried forward from V7.

I think it was a "feature" intended to help... but it creates a problem.

Alt-R "Center Radio" is an important command to center a signal in the 
radio passband. However, it also resets the mode to USB causing the data 
mode to be switched off. This is a BIG pain in the... neck ;-)

Is there something we can do in the Rig File? I don't think so... but...

Otherwise... could Paul please remove this unnecessary and troublesome 
mode set command.

Thanks...

Mel... VE2DC