CologneBlue: Make editform's textareas 100% wide

This was the last skin that didn't have a 100% wide textareas in the
editform. Brought it in line with the other skins. Eventually we
should make this skin use common*.css, but this is needed for
related patch set: I1b92499961b7ea1949e1d1e48ced6f562822d1cd.

Change-Id: I07895f767049a23945d3a989f7a8164f49847934
Merge "CologneBlue: Make editform's textareas 100% wide"