Fixed #14701 - Dropdown | removing a letter from filter that comes af…

…ter a whitespace ' ' removes the whitespace

src/app/components/dropdown/dropdown.ts

@@ -1762,7 +1762,7 @@ export class Dropdown implements OnInit, AfterViewInit, AfterContentInit, AfterV
     }
 
     onFilterInputChange(event: Event | any): void {
-        let value: string = (event.target as HTMLInputElement).value?.trim();
+        let value: string = (event.target as HTMLInputElement).value
         this._filterValue.set(value);
         this.focusedOptionIndex.set(-1);
         this.onFilter.emit({ originalEvent: event, filter: this._filterValue() });