CtfVisualizer: Remove unused signal

Change-Id: I29c47b279dcf1002fa1ffabcb0cd1f2865d4c683
Reviewed-by: Milian Wolff <milian.wolff@kdab.com>

src/plugins/ctfvisualizer/ctfvisualizertool.h

@@ -57,9 +57,6 @@ public:
 
     void loadJson();
 
-signals:
-    void viewsCreated();
-
 private:
     void createViews();