Flexoki palette update

[Leilei332]

• Add modal and selection colors to Flexoki Light palette
• Make Flexoki Light primary color darker to improve contrast
• Make Flexoki Light tiddler subtitle color lighter
• Improve Flexoki Dark contrast

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[Jermolene]

Thank you @Leilei332

[kookma]

Thank you @Leilei332 One question: Is the button border in the sidebar thicker and darker by design? See below images

Flexokilight

Vanilla

The border in Vanilla seems more vibrant and has better contrast

[Leilei332]

Setting button-* colors will cause the button border to use a different style. This happens in Solarized palettes too.

[kookma]

I think another issue should be opened to address this behavior. I will do that