feat: ability to select jar when unlocking fidelity bond

[theborakompanioni]

When "unlocking" the funds of an expired Fidelity Bond, it is automatically placed in Jar A. It would be nice for if users had the ability to select a different destination jar.

Originally posted by @dergigi in https://github.com/joinmarket-webui/jam/issues/556#issuecomment-1348186319

It is now changed to skip the jar selection and default to Jar A automatically - the code to select a Jar is still present for now and can be enabled with a flag - hope that is okay (in case it is decided to enable this flow or provide a toggle).

If we want to keep it in, we could add an Unlock Options to the Unlock modal, just like we have on Receive?

Add this "fold" ...

...to this screen:

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Would still default to A (unless you go through the trouble of changing it) and would hide the complexity nicely, while still providing the option.