Resources: Fixed the themes in examples - All higher swatches ([c-z]) have been replaced with a.

Hi Gabriel,

I found theme [c-z] still exist in examples. So I fixed it in examples of the following widgets.
* collapsible
* collapsibleset
* dialog
* grid-layout
* listview
* panel
* popup
* select
* navbar

To make it easy to check, I separated commits and pushed one commit for each widgets.

If there are any problems or mistakes on that PR, please let me know. 
Thanks in advance. :)