added elif for pygrabber import in ui.py [experimental branch]

[BotStop]

added elif for pygrabber import

via https://github.com/hacksider/Deep-Live-Cam/blob/ac8feff652d92a3f9f4bae3a8403f4ac53d86547/modules/ui.py#L449C1-L450C1

[sourcery-ai]

🧙 Sourcery has finished reviewing your pull request!

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[sourcery-ai]

Hey @BotStop - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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