fix: pass cursor to list in w3 ls (#50)

fixes #48

I added a test for this, but the issue doesn't happen in our current
mock impl. I can spend some more time to make the mock implementation
support `--size` and `--cursor` but it's not clear to me that's the
right move yet - feels a little like adding extra code just to make a
test fail.

index.js

@@ -59,7 +59,7 @@ export async function list (opts = {}) {
   let count = 0
   let res
   do {
-    res = await client.capability.upload.list()
+    res = await client.capability.upload.list({ cursor: res?.cursor })
     count += res.results.length
     if (res.results.length) {
       console.log(uploadListResponseToString(res, opts))