[DOJO] Push/Pull locks out minimum distance.

[Charlemane]

Expected Behavior:

Push/Pull results in the object being pushed away or pulled closer within reasonable bounds.

Actual Results:

Push/Pull snaps the current object to a distance of about 30m in front of the camera, and then disallows pulling an object closer than that.

Steps to Reproduce:

1. Select an existing object.

2. hold X to activate push/pull mode.

3. Move the mouse slightly.

4. The object will snap to a distant minimum distance.