Increased the number of rows in the css editor

Every time someone tries to edit the CSS of a subverse, he/she has to
expand it in order to see it, this was due to a lack of rows in the
TextArea, but I made a small enough change to make it reasonable sized.
Merge pull request #65 from octavus/subredditviews

Increased the number of rows in the css editor of subs to be more comfortable and easy to use.