The Prompt should use a bar cursor if the user has configured Insert mode to use a bar cursor

[frou]

The configuration:

[editor.cursor-shape]
insert = "bar"

...is basically indicating that we want a bar cursor when writing text:

Since writing text is what happens in the prompt, it should respect that setting rather than forcibly using a block cursor:

[frou]

Thank you @GNUSheep for implementing this. Looks like a nice straightforward diff!