Incredibuild: Tr::tr and code cosmetics

Change-Id: Id2facedde38dd09311069711b9e621a95439d433
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/incredibuild/commandbuilderaspect.h

@@ -10,8 +10,7 @@
 #include <QLabel>
 #include <QPointer>
 
-namespace IncrediBuild {
-namespace Internal {
+namespace IncrediBuild::Internal {
 
 class CommandBuilderAspect final : public Utils::BaseAspect
 {
@@ -33,5 +32,4 @@ private:
     class CommandBuilderAspectPrivate *d = nullptr;
 };
 
-} // namespace Internal
-} // namespace IncrediBuild
+} // IncrediBuild::Internal