[dev] Patch: No need to display calendar is default_share is locked

[Chuck Hagenbuch]

Quoting "David U." <davidu@everydns.net>:

> Here's a small patch to remove the "calendar" dropdown in the event edit
> page in case default_share is locked. (always one calendar)

Committed, thanks.

-chuck

--
Charles Hagenbuch, <chuck@horde.org>
"After a few minutes the most aromatic and nice smelling Italian coffee 
 will come out of the exhaustpipe." - Our stove-top espresso pot