[nextjs] An object literal cannot have multiple properties with the same name

[seanValtech]

Describe the bug The template creates an object called ComponentLocationSettings which has multiple entries with the same name

To Reproduce Steps to reproduce the behavior:

1. Create a new app with yarn create contentful-app my-first-next-app --yarn --example nextjs
2. Go to file pages/index.tsx
3. See error as two entries have the name locations.LOCATION_PAGE

Expected behavior Each entry should have a unique name