Creator shows shadow build path in warning about source directory

1. Create or open a project.
2. Configure the project for two incompatible kits.
3. Disable shadow building for both kits.
4. Build the project for one kit.
5. Select the other kit in Projects mode and see the "General" area of the build settings.
   Creator shows the warning: "A build for a different project exists in <shadow build directory>, which will be overwritten."

The build is not in the shadow build directory but in the source directory, so Creator should show this path in the warning.