Update procedure spec editor label font to match block label font

Before:

![screen shot 2014-05-14 at 01 32 40](https://cloud.githubusercontent.com/assets/1578238/2967252/1a58f14c-db2a-11e3-8d02-6b2240c0a843.png)

After:

![screen shot 2014-05-14 at 01 30 49](https://cloud.githubusercontent.com/assets/1578238/2967253/1eb1dae2-db2a-11e3-8d9c-92c281ce0866.png)