title: AsyncTypeahead textbox should clear on backspace
body: <p>The text in the AsyncTypeahead textbox need to make white on the backspace. I have tried different methods by applying CSS, some method change, but that is not suitable. Can you anyone please suggest how to achieve this. Thanks in advance.
  Below I have added the code used:</p>
  <pre><code>&lt;AsyncTypeahead
     className=&quot;&quot;
     id=&quot;typeahead&quot;
     delay={800}
     emptyLabel=&quot;please select&quot;
     ignoreDiacritics={true}
     minLength={3}
     onSearch={this.onSearch}
     placeholder=&quot;Insert text to search&quot;
     promptText={this.searchtext}
     searchText={this.searchtext}
     renderMenuItemChildren={(selectedItem: State, props) =&gt; {
  
     }}
   /&gt;
  </code></pre>
  <p><a href="https://i.stack.imgur.com/4JM98.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/4JM98.png" alt="the result is coming as per the pic" /></a></p>
  <p><a href="https://i.stack.imgur.com/U0eBB.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/U0eBB.png" alt="expected" /></a></p>