[OPEN-342] Bug with single-click - reproducible in 1.5.1

[OPEN-342] Bug with single-click - reproducible in 1.5.1
as posted in the forum at:
http://ext.ensible.com/forum/viewtopic.php?f=3&t=634

The fix is removal of few lines of code (to not to ignore the onClick event). Have tested with the following 2 scenarios:
1) Right click on a event -> the menu items show up
    Move the mouse to another day and click. 'Add Event' form comes up.
2) Right click on an event -> the menu items show up
    click on an existing event. 'Event details' form is displayed.

No known side effects were noticed.