fix: handle alternate client versions when parsing vdf

tests/test_loginusers.py

@@ -0,0 +1,25 @@
+import pytest
+
+from pathlib import Path
+
+from dzgui.api.steam import find_user_id
+from tests.fixtures import fixture_path
+
+pytestmark = pytest.mark.apitest
+
+
+@pytest.mark.parametrize(
+    "fixture, expect",
+    [
+        ("api/loginusers_legacy_client.vdf", 0),
+        ("api/loginusers_legacy_client_multiple.vdf", 1),
+        ("api/loginusers_beta_client.vdf", 0),
+    ],
+)
+def test_loginusers(monkeypatch, fixture: str, expect: int) -> None:
+    def mock_loginusers(path: Path) -> Path:
+        return fixture_path(fixture)
+
+    monkeypatch.setattr("dzgui.api.steam.find_loginusers", mock_loginusers)
+    uid = find_user_id(Path(""))
+    assert int(uid) == expect