komf_live_show_calendar API fixes

[davedieter]

This is third priority to the other two

I realized that this particular calendar is very awkward to use with the "row delete" and "row insert" option. The reason why, is because items need to be updated individually by hour and by day, so deleting and updating an entire line (week) is very very difficult to do without messing up.

This table needs to updated as follows:

• The rows should not deletable (because they are times of the day)
• Rather, the individual fields must be updatable, or clearable
• When fields are cleared, they should default to NULL (right now they default to "None")

I'm open to doing this whatever way makes the most sense