fix: selecting dropdown option should reset filter

This PR solves primefaces#14503.

src/app/components/dropdown/dropdown.ts

@@ -1066,6 +1066,7 @@ export class Dropdown implements OnInit, AfterViewInit, AfterContentInit, AfterV
         this.focusedOptionIndex.set(this.findSelectedOptionIndex());
         isHide && setTimeout(() => this.hide(true), 1);
         preventChange === false && this.onChange.emit({ originalEvent: event, value: value });
+        this.resetFilter();
     }
 
     onOptionMouseEnter(event, index) {