Require write on container for DELETE

[michielbdejong]

See https://gitter.im/solid/test-suite?at=617fd9a9fb3dcd4e885f2ab5

Kjetil Kjernsmo @kjetilk 13:12
I found that NSS isn't checking write on the container for deletes, which is in the draft spec.
Just wondering what you're checking in the test-suite, is it checked there?

and

Michiel de Jong @michielbdejong 14:15
Hm, odd. That indeed seems to be what
https://github.com/solid/web-access-control-tests/blob/main/test/surface/delete.test.ts
is checking, and indeed it doesn't make sense.
if PUT-to-create and PATCH-to-create require write access on the container to create the
containment triple, then DELETE should also require write access on the container to remove it.

[michielbdejong]

As expected (see #41), this increases the number of WAC test failures for CSS v2.0.1 from 6 to 7:
● Create › Using PUT in existing container › is disallowed without accessTo Write or Append
● Create › Using PATCH in existing container › is disallowed without default Write
● Create › Using PATCH in existing container › is disallowed without accessTo Write or Append
● Create › Using PUT in non-existing container › is disallowed without accessTo Write or Append
● Create › Using PATCH in non-existing container › is disallowed without default Write
● Create › Using PATCH in non-existing container › is disallowed without accessTo Write or Append
● Delete › Is disallowed without Write on parent