Docker: Move to Tr::tr

There were no strings in the .ts files yet.

Change-Id: I86e7edace45db796fc3cc80d2735d1a80b897c85
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/docker/kitdetector.h

@@ -30,8 +30,7 @@
 
 #include <QObject>
 
-namespace Docker {
-namespace Internal {
+namespace Docker::Internal {
 
 class KitDetector : public QObject
 {
@@ -52,5 +51,4 @@ private:
     class KitDetectorPrivate *d = nullptr;
 };
 
-} // Internal
-} // Docker
+} // Docker::Internal