189 auto filling cds requests with months and days is incompatible with cds selection limits

[EddyCMWF]

see #189 for full details

[sandorkertesz]

For me the test is failing:

================================================================== FAILURES ==================================================================
_____________________________________________________ test_cds_netcdf_selection_limited ______________________________________________________

    @pytest.mark.long_test
    @pytest.mark.download
    @pytest.mark.skipif(NO_CDS, reason="No access to CDS")
    def test_cds_netcdf_selection_limited():
        s = from_source(
            "cds",
            "satellite-albedo",
            {
                "variable": "albb_bh",
                "satellite": "noaa_7",
                "sensor": "avhrr",
                "product_version": "v2",
                "horizontal_resolution": "4km",
                "year": "1983",
                "month": "01",
                "nominal_day": "10",
            },
        )
>       assert len(s) == 1
E       assert 9 == 1
E        +  where 9 = len(NetCDFFieldListReader(/var/folders/ng/g0zkhc2s42xbslpsywwp_26m0000gn/T/earthkit-data-cgr/cds-251e12d9351edf92911f73f0d23a7914d87dedc25a78f16003866a88be8bf0ef.d/c3s_ALBB-BH_19830110000000_GLOBE_AVHRR-NOAA7_V2.0.1.nc))

tests/sources/test_cds.py:102: AssertionError

[EddyCMWF]

Thanks for fixing the mistake in the test :)