The default values assigned to RailButton sizes were configured with
a 1.0 meter outer diameter and 0.8 meter internal diameter (for 1010
rail buttons) which resulted in overly large rail buttons when added
using the default values.
Presuming that 1010 rail buttons are the common and an acceptable
default, change the default button sizes to align with the 1010 size.
Additionally, this change fixes some of the layout issues present in
add railbutton dialog.
Closes#554
Signed-off-by: Billy Olsen <billy.olsen@gmail.com>