fix(turbopack): Fix CSS Modules of turbopack in swc mode (#7508)
### Description
It seems like I broke `composes` of CSS Modules in swc mode while introducing `lightningcss` mode under a flag.
- Closes PACK-2583
### Testing Instructions
I added a test to turbopack. Alternatively, you can use `TURBOPACK=1 pnpm next dev test/integration/scss/scss-fixtures/composes-basic/`
