Testdevice - fix cppcheck issues

testdevice/testdevice.hpp

@@ -24,7 +24,7 @@ namespace testdevice {
 
   public:
 
-    DeviceSettings(p44::Device &aDevice) :
+    explicit DeviceSettings(p44::Device &aDevice) :
       inherited(aDevice) {};
 
     virtual DsScenePtr newDefaultScene(SceneNo aSceneNo);
@@ -51,7 +51,7 @@ namespace testdevice {
     using inherited = SingleDevice;
 
   public:
-    Device(p44::Vdc *aVdcP);
+    explicit Device(p44::Vdc *aVdcP);
 
     virtual ~Device();