Remove behavior of Knob triggering an Action event if the value has not changed.

src/app/Knob.cpp

@@ -60,11 +60,6 @@ void Knob::onDragEnd(const event::DragEnd &e) {
 			h->newValue = newValue;
 			APP->history->push(h);
 		}
-		else {
-			// Call Action if knob was not changed
-			event::Action eAction;
-			onAction(eAction);
-		}
 	}
 }