coordinate search constraints should show in page title

[ebenenglish]

When I am on a page with a map (catalog#map, catalog#index map view, etc.)
And I click on a coordinate point or use the search tool on the map
I should see the coordinate search constraints in the page title in the browser window

Blacklight::CatalogHelperBehavior#render_search_to_page_title (from projectblacklight/blacklight@47eab51) adds functionality to display search constraints in the page title on catalog#index views. Coordinate search constraints are not displayed, since there is no provision in that method to display them.

We need to add methods to BlacklightMaps::RenderConstraintsOverride to add functionality to include coordinate constraints in the page title.