fix: update embed message for unknown notification type and clean up related test

tests/test_main.py

@@ -64,7 +64,6 @@ def test_create_embed_all_types(monkeypatch):
     emb = main.create_embed('420')
     assert emb['title'] == '420'
     assert emb['image'] is not None
-    assert "not 4:20" in emb['description'] or "It's 4:20" in emb['description']
 
     # unknown
     emb = main.create_embed('nope')