Fixed Combobox when used in tables as editor or renderer

[jmborer]

Hi Revivius,

Many thanks for your very useful project.

I used your project in my own project and spotted a bug that I was finally able to fix: combo-boxes are not properly configured to be rendered with Darcula LaF when used in tables as table editors. They appeared white. Actually they still used Metal values.

I also used the opportunity to do a little code cleanup in the modified file and changed version from 1.6 to 1.6.1

Please feel free to contact me for any questions.

Cheers,

JM