Tuning backup nav with rmp

[Kasluk24]

Description of Changes

• Add backup nav tuning with rmp
• Hide MCDU RADNAV page if backup nav is active
• Hide dme distance on ND if backup nav is active
• The min and max values for the HF tuning are accidentally copied from the A320, but the rest of the code for the HF radios is not taken over.

This is a general question of mine anyway: Should the instruments, which are identical in the A320 and A330, be taken over from the A320 as closely as possible, so that later changes can simply be adopted?
If so, I would adapt the RMP again to follow this principle.

Checklist:

• My changes follow the Contributing Guidelines.
• My changes implement realistic features.
• Please have a main Developer test my changes before merging.
• My changes are ready for merging.

[legoboyvdlp]

@JMaverick16

[Kasluk24]

For my part, you can merge this, even if my general question has not yet been clarified. I think it is maybe better not to have too many open pull requests if there are pending cockpit changes?