Fix includes in mousebuttons example

Remove QtWidgets from buttontester.h and QtGui from main.cpp.

Change-Id: Ie5925a33c58c1abd9747ab0ab7040e7d1b0769a9
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

examples/widgets/widgets/mousebuttons/buttontester.cpp

@@ -41,6 +41,8 @@
 
 #include "buttontester.h"
 
+#include <QDebug>
+
 void ButtonTester::mousePressEvent(QMouseEvent *e)
 {
     int j = ButtonTester::buttonByNumber (e->button());

examples/widgets/widgets/mousebuttons/buttontester.h

@@ -41,10 +41,8 @@
 #ifndef BUTTONTESTER_H
 #define BUTTONTESTER_H
 
-#include <QtWidgets>
 #include <QTextEdit>
 #include <QString>
-#include <QDebug>
 #include <QMouseEvent>
 #include <QWheelEvent>
 

examples/widgets/widgets/mousebuttons/main.cpp

@@ -40,7 +40,10 @@
 ****************************************************************************/
 
 #include "buttontester.h"
-#include <QtGui>
+
+#include <QApplication>
+#include <QPushButton>
+#include <QVBoxLayout>
 
 int main(int argv, char **args)
 {