Revert "Fix kanban draggable bug"

Author: FalkWolsky

client/packages/lowcoder/src/layout/gridItem.tsx

@@ -141,9 +141,7 @@ export function GridItem(props: GridItemProps) {
         onDrag={onDrag}
         onDragEnd={onDragEnd}
         onMouseDown={(e) => {
-          if (isDraggable) {
-            e.stopPropagation();
-          }
+          e.stopPropagation();
           const event = new MouseEvent("mousedown");
           document.dispatchEvent(event);
         }}