e_comp_object: add code to unset clip after finishing effect

e_comp_object: add code to unset clip after finishing effect

There was a bug that the cw->smart_obj's clip was not unset after finishing effect.
At the beginnig of the effect, e called the e_comp_object_effect_clip() function.
However e didn't call the e_comp_object_effect_unclip() when the effect was finished.

FYI, this bug was detected below environment.
1. Enabled screen rotation
2. Applied zoom effect for window
3. Run magnifier service application

Change-Id: Idde9a1fd16ae7d0625ecec71af9b7050cfc617e3