[Bug] Setting just the selected text colour without the background text colour will cause the background colour to change to cyan

[ClementTsang]

Checklist

• I've looked through troubleshooting, known problems, and existing open issues for similar issues.

Describe the issue

The default background colour is light blue. However, if you set just the foreground selected text colour, it will change to cyan.

This is due to having multiple sources of truth in our default styling - see here where it's set to Color::Cyan, but here by default uses Color::LightBlue.

What operating system and version are you using?

Arch Linux

What architecture are you using?

x86_64 / AMD64

What terminal(s) are you running bottom on?

kitty 0.27.1, but irrelevant

What version of bottom are you running?

0.8.0

How did you install bottom?

Arch repos.

How can we reproduce this?

Use a config file of:

[colors]
selected_text_color="Red"

Additional information

No response