Styles dropdown not updated after object style change

[Piotrek Koszuliński]

1. Editor styles.js so Styled image names are shorter (to make them visible in the button.
2. Load <p><img alt="" src="assets/sample.jpg" /></p>.
3. Select image and apply one of the styles.
4. See that the styles dropdown still shows "Styles" instead of the applied style name.
5. Deselect and select image again - styles dropdown shows the applied style name.

Reproduced on master and major. Checked Firefox and Chrome.

[Jakub Ś]

Problem can be reproduced from CKEditor 4.0 (works fine in beta).

NOTE: <p><img alt="" src="assets/sample.jpg" /></p> has to be the only content in editor. First style change doesn't have any effect.