Removed limit when setting Swimlane max height.

Thanks to Meeques, mark-i-m and xet7 !

Fixes #4904

client/components/swimlanes/swimlanes.css

@@ -47,7 +47,6 @@
   display: flex;
   flex-direction: row;
   overflow: 0;
-  max-height: calc(100% - 26px);
 }
 .swimlane.placeholder {
   background-color: rgba(0,0,0,0.2);