title: Different result of `sencha app build` and `sencha app watch` command in sencha-cmd
body: <p>I'm using Extjs-6. I created an app using <code>sencha -sdk D:\xampp\htdocs\Lib\ext-premium-6.0.0\ext-6.0.0 generate app Prj1 D:\xampp\htdocs\ExtProjects\Workspace1\Prj1</code>. I build the project with <code>sencha app build</code> and the theme result is as follow:
  <a href="https://i.stack.imgur.com/j3IDw.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/j3IDw.png" alt="enter image description here" /></a>
  But When I build the project using <code>sencha app watch</code> the them result is as follow:
  <a href="https://i.stack.imgur.com/Pr0uH.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Pr0uH.png" alt="enter image description here" /></a></p>
  <p><strong>Why results are different</strong>?</p>