Use is_equal_approx() instead of vertex_snap when checking if ray is

colliding with equiplanar CSG faces.

modules/csg/csg.cpp

@@ -524,7 +524,7 @@ void CSGBrushOperation::MeshMerge::_add_distance(List<real_t> &r_intersectionsA,
 
 	// Check if distance exists.
 	for (const List<real_t>::Element *E = intersections.front(); E; E = E->next())
-		if (Math::abs(**E - p_distance) < vertex_snap) return;
+		if (Math::is_equal_approx(**E, p_distance)) return;
 
 	intersections.push_back(p_distance);
 }