`dragBetweenLine` element is rendered in the wrong position when `canDropBelowOpenFolders=true`

[doulighan]

Describe the bug
It looks like the dragLine to drop an element below an open folder is actually being rendered at the top of the folder parent item, above its children. There is no line below the open folder.

Chrome
RCT: 2.4.5

extra-drop-line-below-open-folders.mov