Remove unused forward declaration

src/prefs/koprefsdialogcolorsandfonts.h

@@ -13,10 +13,8 @@
 #include "kprefsdialog.h"
 #include <QWidget>
 
-class QLabel;
 class QComboBox;
 class KColorButton;
-class QCheckBox;
 namespace Akonadi {
 class CollectionComboBox;
 }

src/prefs/koprefsdialoggroupscheduling.h

@@ -11,7 +11,6 @@
 #define KOPREFSDIALOGGROUPSCHEDULING_H
 
 #include "kprefsdialog.h"
-class QCheckBox;
 class KOPrefsDialogGroupScheduling : public Korganizer::KPrefsModule
 {
     Q_OBJECT

src/prefs/koprefsdialogmain.h

@@ -11,8 +11,6 @@
 #define KOPREFSDIALOGMAIN_H
 
 #include "kprefsdialog.h"
-class QCheckBox;
-class QLineEdit;
 
 class KOPrefsDialogMain : public Korganizer::KPrefsModule
 {

src/prefs/koprefsdialogtime.h

@@ -14,10 +14,6 @@
 class QSpinBox;
 class KComboBox;
 class QCheckBox;
-class KUrlRequester;
-class KTimeComboBox;
-class QComboBox;
-class QTimeEdit;
 namespace KPIM {
 class KCheckComboBox;
 }

src/prefs/koprefsdialogviews.h

@@ -13,8 +13,6 @@
 #include "kprefsdialog.h"
 
 class KItemIconCheckCombo;
-class QCheckBox;
-class QSpinBox;
 
 class KOPrefsDialogViews : public Korganizer::KPrefsModule
 {