[Evolution] change new appointment default from "for" till "until"

[carpetnailz <carpetnailz researchintegration org>]

I've just switched to evolution 2.10.1 and one new feature is bothering
me. 

When I make a new appointment it takes two clicks to get the form to
show "until" rather than "for" in the "Time" section. I always use
"until." How can I cause that to be the default option on the new
appointment form?

Thanks
nailz