Fix bug in horizon code in nativeccd where parallel faces are included in horizon.

PiperOrigin-RevId: 742687622
Change-Id: I4a180cb9c7451e0a2c22ffd77b7b6f6fd68836a4

src/engine/engine_collision_gjk.c

@@ -1271,7 +1271,7 @@ static int horizonRec(Polytope* pt, Face* face, int e) {
     mjtNum dist2 = face->dist * face->dist;
 
     // v is visible from w so it is deleted and adjacent faces are checked
-    if (dot3(face->v, pt->horizon.w) >= dist2) {
+    if (dot3(face->v, pt->horizon.w) > dist2) {
       deleteFace(pt, face);
 
       // recursively search the adjacent faces on the next two edges