style: ruff format tests/test_wireguard.py

Fixes the CI format check.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_wireguard.py

@@ -47,9 +47,11 @@ def test_conf_content_includes_preshared_key_when_present():
     assert "PresharedKey = cHJlc2hhcmVkLWtleQ==" in content
     # Must sit between PublicKey and Endpoint, inside [Peer].
     peer_section = content.split("[Peer]\n", 1)[1]
-    assert peer_section.index("PublicKey") < peer_section.index(
-        "PresharedKey"
-    ) < peer_section.index("Endpoint")
+    assert (
+        peer_section.index("PublicKey")
+        < peer_section.index("PresharedKey")
+        < peer_section.index("Endpoint")
+    )
 
 
 def test_enable_requires_wg_config(tmp_path):