ayatana-indicator-datetime does not have color squares for different calendars and dates from contacts (birthdays & anniversaries)

[N0rbert]

Steps to reproduce:

1. Install Ubuntu MATE with default ayatana-indicator-datetime and evolution
2. Add event to Personal calendar (default color)
3. Add new calendar and name it for example Work (red color)
4. Create contact with two dates - birthday and anniversary (it is pink color)

Expected results:

• ayatana-indicator-datetime show four coloured events as it was in Ubuntu 12.04 LTS:

  

Actual results:

• ayatana-indicator-datetime show four events without color squares in the left of them

Downstream bug-report:

• https://pad.lv/1828725