test: adjust expected number of contexts in populate test

uvdat/core/tests/test_populate.py

@@ -35,7 +35,7 @@ def test_populate():
     )
 
     assert Chart.objects.all().count() == 1
-    assert Context.objects.all().count() == 3
+    assert Context.objects.all().count() == 2
     assert Dataset.objects.all().count() == 4
     assert DerivedRegion.objects.all().count() == 0
     assert FileItem.objects.all().count() == 7