Clear input after option selection in tomselect fields

Fixes issue #1264

assets/controllers/pages/parameters_autocomplete_controller.js

@@ -75,6 +75,7 @@ export default class extends Controller
             searchField: "name",
             //labelField: "name",
             valueField: "name",
+            clearAfterSelect: true,
             onItemAdd: this.onItemAdd.bind(this),
             render: {
                 option: (data, escape) => {
@@ -136,4 +137,4 @@ export default class extends Controller
         //Destroy the TomSelect instance
         this._tomSelect.destroy();
     }
-}
+}