`BKE_unit_value_as_string` was modified in e949ff7334
to include a `BKE_unit_value_as_string_scaled` version, some places on
the interface needs to use the scaled version to show the string, this
includes ruler gizmo length text.
Pull Request: https://projects.blender.org/blender/blender/pulls/133373
e7efb704fa