Fixed height of logger view.

The height of the logger view is incorrect. It cuts of the last line (see attached image). This is due to the toolbar having a margin that is not included in the calculations when sizing the logger view.

This PR fixes that.

![logger-height-incorrect](https://cloud.githubusercontent.com/assets/487039/5514989/45c66be2-8855-11e4-878c-6ee62ad06ad7.png)