direct: remove empty useless direct.controls.PhysicsRoller module

direct/src/controls/PhysicsRoller.py

@@ -1,2 +0,0 @@
-"""PhysicsRoller is for wheels, soccer balls, billiard balls, and other things that roll."""
-

tests/test_imports.py

@@ -45,7 +45,6 @@ def test_imports_direct():
     import direct.controls.InputState
     import direct.controls.NonPhysicsWalker
     import direct.controls.ObserverWalker
-    import direct.controls.PhysicsRoller
     import direct.controls.PhysicsWalker
     import direct.controls.SwimWalker
     import direct.controls.TwoDWalker