Use anonymous namespace for constants

src/moodbar/moodbarpipeline.cpp

@@ -41,7 +41,9 @@
 
 using std::make_unique;
 
-const int MoodbarPipeline::kBands = 128;
+namespace {
+constexpr int kBands = 128;
+}
 
 MoodbarPipeline::MoodbarPipeline(const QUrl &url, QObject *parent)
     : QObject(parent),

src/moodbar/moodbarpipeline.h

@@ -63,8 +63,6 @@ class MoodbarPipeline : public QObject {
   static GstBusSyncReply BusCallbackSync(GstBus*, GstMessage *msg, gpointer data);
 
  private:
-  static const int kBands;
-
   QUrl url_;
   GstElement *pipeline_;
   GstElement *convert_element_;