Revert "Fix T91444: Edge Loop Preview fails with two Mirror Modifiers"
This reverts commit 1a7757b0bc.
Caused issue reported in T93321, boiling down to the fact that other
operations or modifiers (like the SurfaceDeform one) rely on the order
of the vertices in the mesh to remain consistent.
Changing this in a modifier would mean those operations need to be
reset/re-created (e.g. rebound for the SurfaceDeform case), which is not
doable in `do_version` code.
e6cd4761e7