Set _filterValue from URL parameter `filter`

@function
@private
function(filterInput, uri) {
    var _url = new URL(uri);
    var _filterValueFromURL = _url.searchParams.get('filter');
    if (typeof _filterValueFromURL !== 'undefined' && _filterValueFromURL !== null) {
      _filterValue = _filterValueFromURL;
      filterInput.value = _filterValue; // eslint-disable-line
    }
  }