menuconfig: Use Kconfig.unique_choices in jump-to
menuconfig: Use Kconfig.unique_choices in jump-to

Use Kconfig.unique_choices instead of Kconfig.choices in the jump-to
dialog, as choices defined in multiple locations should only get their
menu nodes added once (to avoid redundant entries).

I noticed a related Kconfiglib issue while working on this:
Kconfig.choices has been identical to Kconfig.unique_choices all long,
so things were never actually broken.

That means Kconfig.choices should be fixed to match its description
though. The next commit will do that.

ulfalizer/Kconfiglib,ulfalizer/Kconfiglib