Working directory is empty when switching run configuration

• Open a qmake project
• Run configuration should have an empty working directory with a placeholder containing the real working directory.
• Add/Switch run configuration -> Working directory is completely empty (no placeholder), and the application is executed from the working directory of Qt Creator (where qtc was executed).

This was caused by using WorkingDirectoryAspect in DesktopQmakeRunConfigurationWidget (commit e0fdeaa624863d3b11f6bafd364a3146d0db24eb)