Minor updates.

bcvalueslider.cpp

@@ -32,7 +32,6 @@
 
 #include <QPushButton>
 
-#include <bcvaluesliderstyle.h>
 #include <bcvalueslider.h>
 
 
@@ -42,7 +41,8 @@ BCValueSlider::BCValueSlider( QWidget *parent )
   setupUi(this);
 
   // wir wollen ja modern sein
-  _slider->setStyle(new BCValueSliderStyle());
+  _sliderStyle = std::make_unique<BCValueSliderStyle>();
+  _slider->setStyle(_sliderStyle.get());
   setAutoFillBackground(true);
 
   QSizePolicy sp = _commitButton->sizePolicy();