[VWR-24197] XUI attributes for path limit constraints inconsistent with actual constraints

1) Use a pre-patch viewer to rez a box 0.5x0.5x10 meters 2) Enter a zero in the Slice Begin and End "E" (End) field 3) Observe that the value is automatically adjusted to a value of 0.05 4) Use a post-patch viewer to rez an identical box next to the first 5) For the new prim, enter a zero in the Slice Begin and End "E" (End) field 6) Observe that a) the value is automatically adjusted to a value of 0.02 7) Observe that new prim appears identically in both pre- and post-patch viewers.