workaround to run after pub install/pub update

After my last pub install/update of my app, modal was broken, always displayed,...
I've the same issue with the widget.dart/web/index.html.
So I : 
1. fix some warning (rename component)
2. fix query to retreive elements
3. add lot of println to trace (removed in the pull request)
4. try some fixe, but at least I was unable (no time) to fix all the bug that raise, but force web_ui to 0.4.4 (no more) seems to fix (at least into index.html).