Diagnostics: debug bar should be always in LTR direction

When developing in RTL mode (Arabic etc.), debug bar is screwed, example from sandbox:
![screenshot from 2013-12-02 10 27 44](https://f.cloud.github.com/assets/144181/1653402/09114d38-5b34-11e3-9380-b7c7e2542b74.png)

This change preserves LTR behavior even in RTL mode.