Revert smaller swimlane height.

Thanks to kovacs-andras and xet7 !

Related #4904,
related https://github.com/wekan/wekan/commit/04aaa6f30cfe59769c9b1c75cf8921fcc99b1977

client/components/swimlanes/swimlanes.css

@@ -47,8 +47,7 @@
   display: flex;
   flex-direction: row;
   overflow: 0;
-  /* max-height: calc(100% - 26px); */
-  max-height: calc(400px);
+  max-height: calc(100% - 26px);
 }
 .swimlane.placeholder {
   background-color: rgba(0,0,0,0.2);