Past/Future events aren't showing in Agenda, UI looks broken

[ane-gabriela]

Issue seems to be related to #42

Steps to reproduce:

1. Create some events in the past, present and in the future on the same or different calendars
   
2. Click on the "Agenda" tag
   
3. Click on the previous and next buttons
   

Expected results: The UI of the Agenda view shows all the necessary information to the user with a vertical line of the background color used for that calendar. The past / present and future events are shown in the respective selection.

Actual results:

1. When clicking on Agenda the UI seems to be broken - no vertical line appears, the title on the Present and Future events are shown on the same line with no brake.
   

2. When clicking on the Past/Future arrows nothing changes, the same view as point 1 remains. The past events aren't shown at all.

Environment: Windows 10, XWiki 12.5.1 with MySQL 8.0 and IE 11, Firefox 94, Edge and Chrome 95, Calendar Application (Pro) 2.10.1

[ClemensRobbenhaar]

This should be fixed via the fix for #74