always show the markdown toolbar in the kanban editor

www/kanban/app-kanban.less

@@ -64,6 +64,9 @@
         display: flex;
         flex-flow: column;
         overflow: hidden;
+        .cp-markdown-toolbar {
+            display: block;
+        }
     }
     #cp-kanban-edit-conflicts {
         padding: 5px;