Remove generated include from headers

Not only fixes compilation with CMake 3.8 (without messing with include
paths) but makes sources cleaner.

src/gui/properties/proplistdelegate.cpp

@@ -28,6 +28,9 @@
  * Contact : chris@qbittorrent.org
  */
 
+#include "proplistdelegate.h"
+
+#include <QApplication>
 #include <QComboBox>
 #include <QModelIndex>
 #include <QPainter>
@@ -42,7 +45,6 @@
 #include "base/utils/misc.h"
 #include "base/utils/string.h"
 #include "propertieswidget.h"
-#include "proplistdelegate.h"
 #include "torrentcontentmodelitem.h"
 
 namespace {