Fix: Unit/UI test build error

[Mark G]

Issue

Running Unit/UI test failed due to a build error on test specs

Expected

Build successfully

Steps to reproduce

1. Run make.sh
2. Run Unit/UI test on Xcode
3. Receive errors from Xcode
   

[Bliss Wetchaya]

@markgravity I am wondering if this is related to tuist folder naming bug and is fixed in #514 🤔