Please change sitemanager to resize bookmarks right-pane

[ecksteinn]

I use the sitemanager bookmarks tab a lot.

The most bookmarks I use have pretty long names & paths.

The sitemanager can be resized but the right pane of the bookmark manager has a fixed-size and thats really bad, you always have to use the scrollbar at the bottom. It doesn't help if only the Site List treeview gets bigger if you resize the whole dialog