* feat: Remove TR# mixsrc when trainer disabled
When trainer mode is not enabled, there is no point
showing the TR# mixer sources. Once you enable a
trainer option, they will become visible again.
* fix: Add missing "Input" check for B&W radios
* fix(cpn): Trainer mode default is off
* chore(cpn): If trainer mode off, hide TR/PPM srcs
* (cpn) Refresh all source lists on change of trainer mode
Co-authored-by: elecpower <neilh713@tpg.com.au>