nixosTests.pleroma: fix test, remove toot patch
nixosTests.pleroma: fix test, remove toot patch

Initially applied via e7f6370701a3e65082e67cd0f9696bcd32c2e9ec, then
reverted by 96aaf29234d4dd39d3fcd49452039269f4730f4f.

Re-applying this patch: the pleroma NixOS test is broken without it.

It was originally impossible to login in toot without having an
interactive shell. I opened https://github.com/ihabunek/toot/pull/180
upstream to fix that and fetch this patch for this test.

The author decided to fix the issue using a slightly different
approach at https://github.com/ihabunek/toot/commit/a3eb5dca24e3efa8f16ebcdc4b7d635dc9af03b7

Because of this upstream fix, our custom patch does not apply anymore.
Using that stdin-based login upstream feature.

Pointing pleroma_ctl to the right RELEASE_COOKIE as well.

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