e_policy_visibility: reset vc->state to ICONIC while canceling visibility job

e_policy_visibility: reset vc->state to ICONIC while canceling visibility job

There was a bug that the window's iconic_state_change event didn't send to the client
in _e_vis_client_add_uniconify_render_pending. This was because the vc->state was
remained to E_VIS_ICONIFY_STATE_RUNNING_UNICONIFY_RENDER_DONE.
This can be occurred when the uniconify_by_visibility job is canceled.

To resolve this problem, we add code to set the vc->state to E_VIS_ICONIFY_STATE_ICONIC
in uniconify_by_visibility job cancel function.

Change-Id: Ie2873be552b15cb3216f1d1dcc3f587807769cb4