Calendar: permanently show share and CalDAV icons, no need to hide those in the settings

Fixes the CalDAV link being hard to find, as blogged about in http://www.bitblokes.de/2013/02/auf-einem-sehr-guten-weg-unterschiede-von-owncloud-5-beta-1-und-owncloud-4-5/ (German)

There’s no need to only show these actions on hover because it’s in the settings anyway. This is a quick fix to make that more discoverable.

Check it @georgehrke @karlitschek