Permit specific property value specification in catalog

[jthele]

Referencing this line of code in has_selected_custom_field:

https://github.com/singer-io/tap-hubspot/blob/master/tap_hubspot/__init__.py#L488

Specifically, the len(x) == 2 conditional.

If all of my requests for property values in the catalog are very specific, like this:

        {
          "breadcrumb": [
            "properties",
            "property_hs_lastmodifieddate",
            "properties",
            "value"
          ],
          "metadata": {
            "selected": true
          }
        },

That conditional will result in me getting no properties at all. A very simple fix would be to replace with len(x) >= 2.