Fix setting gui.selectedLineBgColor as a hex value

[stefanhaller]

• PR Description

When trying to set gui.selectedRangeBgColor to a hex value, it would get set to nothing instead. Named colors worked though.

I don't understand why this didn't seem to affect any of the other colors that are set with GetTextStyle, e.g. selectedLineBgColor. But the fix here still seems right to me.

• Please check if the PR fulfills these requirements

• Cheatsheets are up-to-date (run go run scripts/cheatsheet/main.go generate)
• Code has been formatted (see here)
• Tests have been added/updated (see here for the integration test guide)
• Text is internationalised (see here)
• Docs (specifically docs/Config.md) have been updated if necessary
• You've read through your own file changes for silly mistakes etc

[github-actions]

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☁️ https://app.uffizzi.com/github.com/jesseduffield/lazygit/pull/2483

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[mark2185]

This looks like it should fix #1749 , so thanks for that :)

[jesseduffield]

Code looks good. Any chance you could add a test for this function that asserts on the new behaviour?

[stefanhaller]

First time I wrote a unit test file from scratch, hope this looks ok.

I used my usual preferred way of introducing the test first to demonstrate what's broken, let me know if you prefer to squash the two commits.

[jesseduffield]

Perfect :) Happy to keep that as two commits.