Recapture focus after clicking on an already selected image 

Clicking on a selected image will lose the event trap focus. Focus needs to be restored back to the event trap after this.

Reproduction of issue:
1) Open http://ci.kogmbh.com/deploy/WebODF/webodf-ci-b165-gf753ec2b/editor/localeditor.html
2) Click on the the image twice
3) hit the delete key. Note that the image is not deleted.