fix(collapse): default to css
fix(collapse): default to css

- Default to value set from CSS for height/width

Closes #6182
Fixes #6045

vfiles/bootstrap,shootermv/bootstrap,Servoy/bootstrap,Kpler/bootstrap,fpipita/bootstrap,RobJacobs/bootstrap,looker/bootstrap,vfiles/bootstrap,looker/bootstrap,caoruiy/bootstrap,shootermv/bootstrap,RobJacobs/bootstrap,angular-ui/bootstrap,Kpler/bootstrap,angular-ui/bootstrap,Servoy/bootstrap,BookingBug/bootstrap,caoruiy/bootstrap,byronigoe/bootstrap,icfantv/bootstrap,BookingBug/bootstrap,icfantv/bootstrap,fpipita/bootstrap,byronigoe/bootstrap