Change border colour in dark mode

[C0DE-SLAYER]

Pull Request

Fixes #280

Description: Changed the border colour of the pie chart in dark mode

Checklist:

• [x] I have tested my changes.
• [x] My code follows the project's coding standards.
• [x] I have updated the documentation (if applicable).

Screenshots:

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Name	Status	Preview	Comments	Updated (UTC)
spendwise	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 30, 2023 4:00pm