fix(nextjs): Fixes Next JS Component generator to export component when 'export' flag is provided

[ndcunningham]

Current Behavior

Nothing happens to the library index.ts when --export is provided to the @nrwl/next:component generator

Expected Behavior

mylib/src/index.ts should be updated to export the new component when created with --export

Related Issue(s)

Fixes #
#10322

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✅ Successfully ran 11 targets

• nx affected --target=e2e --base=3de1cb608966654b691e502a439fc0205e5b9d55 --head=9b1029d8f60452b144a1536a801525ee0f8ea393 --exclude=e2e-storybook,e2e-react-native,e2e-detox --parallel=1
• nx affected --target=test --base=3de1cb608966654b691e502a439fc0205e5b9d55 --head=9b1029d8f60452b144a1536a801525ee0f8ea393 --parallel=1
• nx affected --target=build --base=3de1cb608966654b691e502a439fc0205e5b9d55 --head=9b1029d8f60452b144a1536a801525ee0f8ea393 --parallel=3
• nx affected --target=lint --base=3de1cb608966654b691e502a439fc0205e5b9d55 --head=9b1029d8f60452b144a1536a801525ee0f8ea393 --parallel=3
• nx-cloud record -- yarn nx workspace-lint
• nx-cloud record -- yarn documentation
• nx build typedoc-theme
• nx-cloud record -- yarn depcheck
• nx-cloud record -- yarn check-commit
• nx-cloud record -- yarn nx format:check --base=3de1cb608966654b691e502a439fc0205e5b9d55 --head=9b1029d8f60452b144a1536a801525ee0f8ea393
• nx-cloud record -- yarn check-imports

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