Revert "[fx] rewrite `FloorDiv` to match Python better (#90906)"
This reverts commit d13207c7adf7f94620b1228dab547ff253c46d0b.
Reverted https://github.com/pytorch/pytorch/pull/90906 on behalf of https://github.com/malfet due to eca_halonext26ts started failing after 2nd PR from the stack was landed, see https://hud.pytorch.org/pytorch/pytorch/commit/88b3810c94b45f5982df616e2bc4c471d173f491, not sure which one of the two caused it
