Fixes bg/fg colors on table

I didn't realize that [this commit](https://github.com/MrRio/vtop/commit/0378da503e8a2bca55160061accc1c0999479f3b) sort of broke the colors on the table. When I booted it into the dark theme, it looked hideous. Now they look nice and beautiful again.

> **Note**: I'm aware that the commit added necessary fields, but it didn't honestly look like the color scheme was chosen well. No offense intended towards James.

Thanks :)