Remove unnecessary dismissCurrentDropdown

app/assets/javascripts/filtered_search/filtered_search_manager.js.es6

@@ -154,7 +154,6 @@
 
         const dropdownOffset = gl.text.getTextWidth(filteredSearch.value) + filterIconPadding;
 
-        this.dismissCurrentDropdown();
         this.currentDropdown = 'hint';
 
         if (!dropdownHint) {
@@ -165,12 +164,6 @@
       }
     }
 
-    dismissCurrentDropdown() {
-      if (this.currentDropdown === 'hint') {
-        dropdownHint.destroy();
-      }
-    }
-
     setDropdown() {
       const { lastToken } = this.tokenizer.processTokens(document.querySelector('.filtered-search').value);