improved theme selector focused item contrast in light theme

[puntogris]

PR Checklist

Please check if your PR fulfills the following requirements:

• [ ] Tests for the changes have been added (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• [x] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, local variables)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] CI related changes
• [ ] Documentation content changes
• [ ] infrastructure changes
• [ ] Other... Please describe:

What is the current behavior?

When using light theme the themes selector item focused text color is difficult to see(dark text on dark background).

What is the new behavior?

Changed the color to light text on dark background on light theme to provide more contrast when focused.

Other information