Replaced Task Tracker font size option with one for Time Tracker

Issue #105

Replaced Task tracker font-size change setting with one for Time Tracker since
it's not the main window.

![snap0015](https://f.cloud.github.com/assets/17997/375262/90b3b9c2-a3b7-11e2-9160-1c82c7e3b6ee.png)