Change layout in code style selector.
Make it possible to see the values
of built-in code style without a need to copy it.
Built-in code style can be also modified after
being copied inside code style editor.
Task-number: QTCREATORBUG-6341
Change-Id: Ifcbf807d5730ccf9026e86572710d0cc0ccf9f1a
Reviewed-by: Leandro T. C. Melo <leandro.melo@nokia.com>
Reviewed-by: Christian Kamm <christian.d.kamm@nokia.com>
