Sudivision Surface modifier: Use Limit Surface even when level = 0

The "Use Limit Surface" option in the Subdivision Surface modifier is a great new feature. However, in Blender 2.91, it's ignored when subdivision level is 0.

This proposal is simple: Use this option even when subdivision level is 0!

Reason: When exporting mesh LODs (eg. for a game), the "Use Limit Surface" option gives a better LOD.