Remove event handling in device constructor. Seems it was not really the cause for the problems, only the missing size update of the d3d9 driver. To avoid complications, only the least change was left in.
Also improved the userclipplane test to really show errors in case of the original problem.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4303 dfc29bdd-3216-0410-991c-e03cc46cb475