fix(nextjs): Generate an unstyled component when --style=none

[ndcunningham]

When you run nx g @nx/next:app acme --style=none

Before you would have:

import styled from 'none';

const StyledPage = styled.div`
  .page {
  }
`;

Now those will not be generated

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Name	Status	Preview	Comments	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 24, 2023 8:55pm

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✅ Successfully ran 7 targets

• nx affected --target=e2e --base=fe4682a0e7f918d2e2b13a1bff50d4d007fc8f45 --head=7f27eadf4d2ac3b6cf338f9cb311984e3f8b2d09 --parallel=1
• nx affected --target=build --base=fe4682a0e7f918d2e2b13a1bff50d4d007fc8f45 --head=7f27eadf4d2ac3b6cf338f9cb311984e3f8b2d09 --parallel=3
• nx affected --target=test --base=fe4682a0e7f918d2e2b13a1bff50d4d007fc8f45 --head=7f27eadf4d2ac3b6cf338f9cb311984e3f8b2d09 --parallel=1
• nx run-many -t check-imports check-commit check-lock-files depcheck check-codeowners --parallel=1 --no-dte
• nx affected --target=lint --base=fe4682a0e7f918d2e2b13a1bff50d4d007fc8f45 --head=7f27eadf4d2ac3b6cf338f9cb311984e3f8b2d09 --parallel=3
• nx-cloud record -- nx format:check --base=fe4682a0e7f918d2e2b13a1bff50d4d007fc8f45 --head=7f27eadf4d2ac3b6cf338f9cb311984e3f8b2d09
• nx affected -t e2e-macos --parallel=1 --base=fe4682a0e7f918d2e2b13a1bff50d4d007fc8f45 --head=7f27eadf4d2ac3b6cf338f9cb311984e3f8b2d09

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