Blender Git Loki

Fix T84824: Incorrect height using interactive add tool

When using the interactive add tool for primitives with a fixed
height and base aspect ratio, the height of the created primitive
would be incorrect (two times too small or two times too big).

When the base origin was centered, the `fixed_aspect_dimension`
was not changed even though the base length was doubled.
Additionally, when the height origin was centered but the height
aspect ratio was fixed, the height was doubled leading to an
incorrect size.

The fix doubles `fixed_aspect_dimension` when the base origin is
centered and correctly calculates the height of the primitive when
the aspect ratio is set to fixed.

Ref D10140