Refactor Select widget.
Refactor Select widget.

- Display value instead of key in readonly mode.
- Clean widget.

marioestradarosa/axelor-development-kit,axelor/axelor-development-kit,donsunsoft/axelor-development-kit,marioestradarosa/axelor-development-kit,marioestradarosa/axelor-development-kit,axelor/axelor-development-kit,axelor/axelor-development-kit,donsunsoft/axelor-development-kit,axelor/axelor-development-kit,marioestradarosa/axelor-development-kit,donsunsoft/axelor-development-kit,donsunsoft/axelor-development-kit