Adjust content of debug[3] FFT_FREQ

[McGiverGim]

Fixes #239

The content of the debug[3] field, that was empty, has changed since 3.5.0 and stores the raw gyro roll data.

I have made the simplest change possible, changing the name of the content for all versions because:

• It's only a debug value
• At the moment that the names list is readed, there is no info of version. So adjust the name to the version will mess the code.
• The worst that happens is that versions earlier to 3.5.0 will have a zero value always in this field.

[McGiverGim]

After talking with @ctzsnooze added the not merge label, because maybe this debug[3] value can change. Waiting for the final version of dyn filter.