Correct nominatim URL format

Remove trailing '/' from nominatim URL as this URL format is no longer supported:
 /search/?q=query URL format no longer supported (should be /search?q=query) #3134 
osm-search/Nominatim#3134

Author: danielmwilson

src/providers/osm.js

@@ -7,7 +7,7 @@ export class OpenStreet {
    */
   constructor() {
     this.settings = {
-      url: 'https://nominatim.openstreetmap.org/search/',
+      url: 'https://nominatim.openstreetmap.org/search',
 
       params: {
         q: '',