Fix [#35173] Object's draw_type resets when removing smoke

New behaviour:
* On creation, smoke modifier only changes the drawtype for domain to WIRE.
* On deletion, smoke modifier does not change the drawtype.

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56469 954f8c5b-7b00-dc11-b283-0030488c597c