Add path prefix to geocoder autocomplete ajax call to include current language

Closes #3418621

js/geocoder.drupal.js

@@ -8,7 +8,8 @@
     attach(context, settings) {
       function geocode(address, providers, addressFormat) {
         const { baseUrl } = drupalSettings.path;
-        const geocodePath = `${baseUrl}geocoder / api / geocode`;
+        const pathPrefix = drupalSettings.path.pathPrefix;
+        const geocodePath = `${baseUrl}${pathPrefix}geocoder / api / geocode`;
         const addressFormatQueryUrl =
           addressFormat === null ? '' : ` & addressFormat = ${addressFormat}`;
         return $.ajax({