Tidy up some unused public declarations

modules/juce_gui_extra/misc/juce_ColourSelector.h

@@ -133,16 +133,13 @@ public:
         labelTextColourId               = 0x1007001     /**< the colour used for the labels next to the sliders. */
     };
 
+private:
     //==============================================================================
-    // These need to be public otherwise the Projucer's live-build engine will complain
+    class SwatchComponent;
     class ColourSpaceView;
     class HueSelectorComp;
     class ColourPreviewComp;
 
-private:
-    //==============================================================================
-    class SwatchComponent;
-
     Colour colour;
     float h, s, v;
     std::unique_ptr<Slider> sliders[4];