Fix for Statement has no effect

This problem and its fix was suggested by copilot, I'm just writing the
cover letter.
test/nodetool/test_status.py has the silly statement tokens == "?" which
has no effect. Looking around the code suggested to me (and also to
Copilot, nice) that the correct intent was assert tokens == "?" and not,
say, tokens = "?".

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Closes scylladb/scylladb#27659

test/nodetool/test_status.py

@@ -109,7 +109,7 @@ def validate_status_output(res, keyspace, nodes, ownership, resolve, effective_o
                 assert load_unit is not None
                 assert load == "{:.2f}".format(int(node.load) / load_multiplier[load_unit])
             if token_count_unknown:
-                tokens == "?"
+                assert tokens == "?"
             else:
                 assert int(tokens) == len(node.tokens)
             if effective_ownership_unknown: