Use BW button for an RDS reset in AF/EON window

[andimik]

Due to the fact, that in AF/EON window we cannot change the frequency, the BW button is "dead" now and has (currently) no function. (Hint: MODE button will switch to 2/2 resp. back to 1/2 for huge AF >33 frequencies and BAND button will close the window and will go back to advanced RDS window)

So I suggest to use BW button for a RDS reset in case of errors.

[PE5PVB]

There is already a check for 0 errors in the last repository, so it should be error free. I have other plans for that button.