Fix knobs with minValue > maxValue, fix shadows on SVGKnob when not

calling setSVG()

src/app/Knob.cpp

@@ -30,7 +30,7 @@ void Knob::onDragMove(EventDragMove &e) {
 	if (windowIsModPressed())
 		delta /= 16.0;
 	dragValue += delta;
-	dragValue = clamp(dragValue, minValue, maxValue);
+	dragValue = clamp2(dragValue, minValue, maxValue);
 	if (snap)
 		setValue(roundf(dragValue));
 	else

src/app/SVGKnob.cpp

@@ -7,6 +7,7 @@ namespace rack {
 SVGKnob::SVGKnob() {
 	shadow = new CircularShadow();
 	addChild(shadow);
+	shadow->box.size = Vec();
 
 	tw = new TransformWidget();
 	addChild(tw);