Sidebar fixes

This PR fixes the number of projects that are displayed in the `facets` view and the map sidebar. In the `facets` view, we calculate the number of projects for countries contributing to the core fund. 

When selecting a recipient office, this number should be cleared from the `facet view` and the sidebar and replaced with the number of projects funded by the donor country into the recipient office, without adding the UNDP core fund. 

cc @smit1678 @jueyang