Add a back button in the "Computer Cleanup" interface.

[huang1111]

<p><strong>Reproduction steps:</strong></p>
<p><span>as the picture shows.</span></p>
<p><strong>Actual result:</strong></p>
<p><span>It is not possible to return directly to the previous level.</span></p>
<p><strong>Expected Result:</strong></p>
<p><span>Can return to the previous level.</span></p>

[Dmitriy.Pisarets]

<p>hello!  cannot be reproduced witn new UI</p>