[SWA-131][FIX] - Update background in Popups to be as intended

[ElRodrigote]

Fixes: SWA-131

Description

• Update background in Popups to be as intended

Visual evidence

How to test the changes

1. Pull this branch
2. Run the project locally
3. Go to Swapr landing page
4. Connect your wallet
5. All the popups should have their corresponding backgrounds: Liquidity V3 should have the black&purple and the TX popup should have it's dark gray background

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Lighthouse	1 paths audited Performance: 25 (no change from production) Accessibility: 80 (no change from production) Best Practices: 92 (no change from production) SEO: 67 (no change from production) PWA: 80 (no change from production) View the detailed breakdown and full score reports

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[0xVenky]

Looking good!. Lets merge after review :)