chore(packages/ui turbo gen config.ts): Preventing the format of pack… (#8033)
…age.json from being corrupted
### Description
Prevent the format of `package.json` from getting corrupted when
creating a component with `turbo gen`.
Here's what the exports section looks like before and after the fix:
before
```
"exports": {
"./foo": "./src/foo.tsx",
"./button": "./src/button.tsx",
"./card": "./src/card.tsx",
"./code": "./src/code.tsx"
},
```
after
```
"exports": {
"./foo": "./src/foo.tsx",
"./button": "./src/button.tsx",
"./card": "./src/card.tsx",
"./code": "./src/code.tsx"
},
```
### Testing Instructions
1. Create a component with `turbo gen`.
2. Check package.json.
Co-authored-by: Anthony Shew <anthony.shew@vercel.com>