Fix X BadRequest errors in TestInteractorStyleImageProperty.

This test was crashing once or twice a week on certain Linux machines.
I have rewritten it so that it only creates and maps one window.

Change-Id: Ia5d2f2d4617afd93013440bb13f5a3de9a730d02
Merge topic 'imageproperty-test' into master

2465c99f Fix X BadRequest errors in TestInteractorStyleImageProperty.