Update defaultdict snippet expectation for Jedi 0.20

Jedi 0.20 now resolves collections.defaultdict with an empty callable
signature, so pylsp formats the completion as defaultdict() instead of
the placeholder snippet defaultdict($0). Update the completion test to
reflect that this result is plain insert text and therefore does not
include insertTextFormat.

Author: mcepl

test/plugins/test_completion.py

@@ -334,8 +334,8 @@ def test_snippets_completion(config, workspace) -> None:
 
     com_position = {"line": 1, "character": len(doc_snippets)}
     completions = pylsp_jedi_completions(config, doc, com_position)
-    assert completions[0]["insertText"] == "defaultdict($0)"
-    assert completions[0]["insertTextFormat"] == lsp.InsertTextFormat.Snippet
+    assert completions[0]["insertText"] == "defaultdict()"
+    assert not completions[0].get("insertTextFormat", None)
 
 
 def test_snippets_completion_at_most(config, workspace) -> None: