feature request: close search bar on click on x button

[LuisReinoso]

Add a config to close search bar on click or emit event when user click on x button in search bar.

It's a llitle bit confuse when search bar is open from search icon. Suggested source code to edit: https://github.com/smeijer/leaflet-geosearch/blob/develop/src/SearchControl.ts#L193

[smeijer]

Fixed by #335