[kronolith] Changing the Default Calendar

[medic at computermedic.org]

I upgraded from horde 2.2 to horde 3.0 and the calendar is hard to get used to.
I have to continually select the right calendar in the drop down menu on the
upper right to get the correct calendar. This is very confusing to my users. I
have tried setting this calendar to default, but it does not seem to remember
this setting. How can I get kronolith to choose the users calendar as default
on login?