Fix preference node used by GUIUtils.recallPosition()
Fix preference node used by GUIUtils.recallPosition()

Don't use nodes in the root node (e.g. "foo.bar.Baz"). Use, e.g.,
"org/micromanager/utils/window_prefs/foo.bar.Baz" instead.

git-svn-id: 03a8048b5ee8463be5048a3801110fb50f378627@15664 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd

kmdouglass/Micro-Manager,kmdouglass/Micro-Manager