[FIX] website_event_track_online: fix agenda column size and reduce first column

Purpose is to have same width for all columns and a better display of agenda
with evenly dispatched columns.

Related to testing of EventOnline
Task ID-2314778
Fwd port of PR #55625
PR #55642

addons/website_event_track_online/static/src/scss/event_track_templates.scss

@@ -53,6 +53,7 @@
     }
 
     table {
+        table-layout:fixed;
         border-collapse: separate;
         border-spacing: 0em 0em;
         tr {
@@ -69,6 +70,9 @@
         th.active, td:not(.active) {
             background-color: #d3d3d36e;
         }
+        th:not(.active), td.active {
+            width: 150px;
+        }
         th.position-sticky {
             left: 0;
         }