Fix test error caused by breaking change in EE API

It looks like the string repr for `ee.Projection` changed to
`ee.projection.Projection`, so my check for the fallback repr
started failing. Just updated that to match the new repr.

tests/test_reprs.py

@@ -10,4 +10,4 @@ def test_error():
     """
     with pytest.warns(UserWarning):
         rep = ee.Projection("not a real epsg")._repr_html_()
-    assert "ee.Projection object" in rep
+    assert "Projection object" in rep