use const for props in default components

[tim-quebic]

The element and leaf props in DefaultElement and DefaultLeaf respectively were causing warnings because they were unused vars.

I changed them to const and set default values.

[nathanfaucett]

I get this warning in the browser <DefaultLeaf> was created with unknown prop 'leaf', I think it would be better to use // svelte-ignore unused-export-let above each instead to just to suppress the warning

[tim-quebic]

I get this warning in the browser <DefaultLeaf> was created with unknown prop 'leaf', I think it would be better to use // svelte-ignore unused-export-let above each instead to just to suppress the warning

Unfortunately I don't think this works, see here: sveltejs/svelte#5892

[nathanfaucett]

It does for me, just tried it locally, maybe they fixed it in another PR

[tim-quebic]

It does for me, just tried it locally, maybe they fixed it in another PR

maybe it's just svelte-kit that doesn't respect // svelte-ignore? i think that's fine. i updated the branch to use // svelte-ignore