Fix lupdate warnings in WinRT-plugin.

Fix duplicated messages and missing Q_OBJECT.

src/plugins/winrt/winrtdeployconfiguration.cpp:57: Class 'WinRt::Internal::WinRtDeployConfigurationFactory' lacks Q_OBJECT macro
src/plugins/winrt/winrtdeployconfiguration.cpp:148: Class 'WinRt::Internal::WinRtDeployStepFactory' lacks Q_OBJECT macro
src/plugins/winrt/winrtdeployconfiguration.cpp:197: Class 'WinRt::Internal::WinRtDeployConfiguration' lacks Q_OBJECT macro

Change-Id: I49756e05411330fb1cc6281da8cfc677e5e6d1af
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>