Accessors aren't typed when using customElements: true

[vultix]

Describe the bug
svelte2tsx doesn't type accessors when compiling using customElements: true. Using custom elements automatically enables accessors for all files, so those properties should be typed.

Setting accessors: true in your svelte.config.js file also doesn't work.

To Reproduce
Here's an example project: svelte-bug.zip

If you run npm i and try a svelte-check you should get this error:

Property 'test' does not exist on type 'Lib__SvelteComponent_'

The error goes away if you update line 1 of src/Lib.svelte to this:

<svelte:options tag="test-lib" accessors={true} />

This is a reasonable workaround, but shouldn't be required.