Allow variable height for board list items

This fixes https://github.com/wekan/wekan/issues/3041.

client/components/boards/boardsList.styl

@@ -33,7 +33,7 @@ $spaceBetweenTiles = 16px
     overflow: hidden;
     background-color: #999
     color: #f6f6f6
-    height: 90px
+    height: auto
     font-size: 16px
     line-height: 22px
     border-radius: 3px