...by removing the unneeded ProjectFileAdder. Its job is already done
earlier, so use the results.

Change-Id: Ifd865e6203ed6162a0d852c2128fb6d30208a52b
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Christian Kandeler <christian.kandeler@theqtcompany.com>