AgentPress Listings Search widget select fields lose selection on search results page

[nickcernis]

As reported on WP.org, the selected taxonomies are lost when viewing search results such as this:

http://demo.studiopress.com/agentpress/?s=&post_type=listing&bedrooms=4-bedrooms

Observed behaviour: No value is selected in the “Bedrooms” select field.
Expected behaviour: “4 bedrooms” (the originally selected query) is preselected in the “Bedrooms” select field.

Adding global $wp_query; near the top of the widget() function in agentpress-listings/includes/class-property-search-widget.php fixes this in my tests.