The previous remesh_self_intersections.cpp and intersect_other.cpp had a branch

if detect_only
  use Epick to find intersections
else
  use Epeck to find and resolve intersections

This only depended on the boolean flag detect_only. Unfortunately, that meant if the caller's input vertices were in the exact type CGAL::Epeck::FT and detect_only=true, then the input would be converted (i.e., rounded) to CGAL::Epick::FT (aka double) before looking for intersections. This leads to false positives.

This PR replaces the branch with if detect_only and not Epeck input.

Hopefully this merges easily so I can get it in before finishing #1539 1895