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Fix T85194: Smart UV does not respect "Correct Aspect" correctly

This lead to wrong, stretched UVs regardless of the ON/OFF state of
"Correct Aspect" option (some code in the operator respected this
setting properly, whereas it was hardcoded in another part).

Before rB9296ba867462, `uvedit_pack_islands_multi` was always called
with `correct_aspect` = false for the UnwrapOptions.
After rB9296ba867462, `ED_uvedit_pack_islands_multi` was always called
with `correct_aspect` = true for the UVPackIsland_Params.

Both seem wrong [in that they do not take the operator setting into
account]. Now respect that setting [same as the following
`uv_map_clip_correct_multi` does as well btw.]

Now results match 2.90 [where this was still python] perfectly.

Maniphest Tasks: T85194

Differential Revision: https://developer.blender.org/D10246