Don't update SUFFIX_FORMAT_MAP in plugins/parsers/jsonld.py

[aucampia]

jsonld will already be in SUFFIX_FORMAT_MAP, so the code being
removed here should have no effect.

There are already tests for this and the tests would fail of the removed
code did anything, see:

rdflib/test/test_parse_file_guess_format.py

Lines 23 to 34 in b2fdaf5

	def test_guess_format(self) -> None:
	self.assertEqual(guess_format("example.trix"), "trix")
	self.assertEqual(guess_format("local-file.jsonld"), "json-ld")
	self.assertEqual(guess_format("local-file.json-ld"), "json-ld")
	self.assertEqual(guess_format("/some/place/on/disk/example.json"), "json-ld")
	self.assertEqual(guess_format("../../relative/place/on/disk/example.json"), "json-ld")
	self.assertEqual(guess_format("example.rdf"), "xml")
	self.assertEqual(guess_format("example.nt"), "nt")
	self.assertEqual(guess_format("example.n3"), "n3")
	self.assertIsNone(guess_format("example.docx", None))
	self.assertIsNone(guess_format("example", None))
	self.assertIsNone(guess_format("example.mkv", None))

[niklasl]

LGTM! (This was just a hack done by rdflib-jsonld when it was an external package.)

[nicholascar]

Good tidy-up