navigation behaviour update:

when navigating from a selected item and choosing it again without
choosing a different item in between start from where left instead of
beginning

LenaPi/models/MusicModel.cpp

@@ -17,6 +17,9 @@ MusicModel::~MusicModel()
 
 void MusicModel::init(NavigationItemModel *item)
 {
+    if(mCurrentItem == item){
+        return;
+    }
     mCurrentItem = item;
     emit currentItemChanged();