added space in Jade to the arrow and opt out text in the inbox

This resolves https://github.com/HabitRPG/habitrpg/issues/4311 and is also referenced from this pull: https://github.com/HabitRPG/habitrpg/pull/4359.

I changed the jade files to allow spaces for both the arrow and the opt out message without the need for a css change.

![screenshot 2014-12-10 12 57 13](https://cloud.githubusercontent.com/assets/5234453/5384255/d395424a-806c-11e4-9719-8b5ce0ee5329.png)