fix(web): count initial import from tracked videos

tests/test_web_queries.py

@@ -35,6 +35,7 @@ def test_overview():
             assert overview["data_date"] == DATES[-1]
             assert overview["snapshot_days"] == 3
             assert overview["is_first_day"] is False
+            assert overview["initial_import_count"] == 2
             assert overview["counts"]["active"] == 2
             assert overview["counts"]["unfaved"] == 1
             assert overview["counts"]["removed"] == 1