Fixed problem, that search field and search options did not close when clicking outside

This fixes issue #701. For the search field this was caused by algolia/autocomplete lib, which do not support multiple autocomplete fields on a single page. If initailly loaded on the homepage, which features a second autocomplete, this one "steals" the input listening, and the one in the navbar do not close anymore when clicking outside.
Custom code which triggers the closing of the autocomplete manually when clicking outside, was added as a workaround.

assets/controllers/elements/part_search_controller.js

@@ -186,5 +186,15 @@ export default class extends Controller {
                 ];
             },
         });
+
+        //Try to find the input field and register a defocus handler. This is necessarry, as by default the autocomplete
+        //lib has problems when multiple inputs are present on the page. (see https://github.com/algolia/autocomplete/issues/1216)
+        const inputs = this.element.getElementsByClassName('aa-Input');
+        for (const input of inputs) {
+            input.addEventListener('blur', () => {
+                this._autocomplete.setIsOpen(false);
+            });
+        }
+
     }
 }