add 7 pixels to one of the octree data construction divs in the GUI

[ageller]

In the octree mode, the main/general/data panel in the GUI has extra elements. One of those needs 7 extra pixels. Aaron instead added 7 pixels to the bottom of the "Initial Settings" and "Load Settings" div. But we should fix that and add it to the correct div (and remove that extra 7 pixels that Aaron added). This change is in effect on the server and will need to be dealt with when we make the change here.