Disable hfields for collision sensors.

PiperOrigin-RevId: 685730321
Change-Id: Ib1d4a90b7b31ca388e018076a274e25c40409080

src/user/user_objects.h

@@ -530,6 +530,7 @@ class mjCGeom : public mjCGeom_, private mjsGeom {
   void SetInertia(void);              // compute and set geom inertia
   bool IsVisual(void) const { return visual_; }
   void SetNotVisual(void) { visual_ = false; }
+  mjtGeom Type() const { return type; }
 
   // Compute all coefs modeling the interaction with the surrounding fluid.
   void SetFluidCoefs(void);