Fix existing tuner input type to display all options and configure, it currently does not

Currently, with v9 (as of 01/2022) when one clicks on an _existing_ tuner to change input type (i.e. Component+SPDIF, Composite etc.) it doesn't display _all_ options that are shown when adding a _new_ tuner (i.e. Component with analog RCA audio input is missing).

This would be helpful to flush this out and display every option. One example case is when there are occasional issues with HD-PVR and digital audio sources and one needs as easy way to alter the input without having to delete and then re-add the tuner.

I'm not sure if this is a problem with the way HD-PVR tuner type is defined or a more general problem with all tuners.