Issue #12546: Define Map Object GUI ranges
This patch attempts to resolve issue #12546 (closed).
While we want to allow a flexible range for the Box and Cylinder dimensions when called non-interactively, having a large range in the GUI makes it difficult for users to precisely set those values.
This patch adds calls to gimp_scale_entry_set_bounds ()
to match the 2.10 GUI ranges, while letting the values be
larger then that when called via the PDB.