[IE9-10] Image properties don't get updated.

[Jakub Ś]

To reproduce:

1. Clear editor contents with New Page command
2. Click image dialog and insert in URL filed assets/sample.jpg
3. Don't click anywhere else and just click OK
4. If you inspect code with dev-tools you will notice that width and height that is by default placed in style attribute isn't present.
5. Double click on image to open its properties.

Result: width and height fields are empty.

Problem can be reproduced in IE9 and IE10 from CKEditor 4.0 Beta