Loading toggling css with JavaScript

Not sure why it is loaded with rest - none of the rules work without
JavaScript any way.

Also fixes bug: 65503 as a side effect (since the client-js class
gets added before the toggle.js code and the .icon class)

Change-Id: I3d94db3f748426fd98871615edd004d40f71b24f
Merge "Loading toggling css with JavaScript"