Remove currentIndexChanged signal from RpgComboBox

The currentIndexChanged signal in RpgComboBox which has been added
earlier in this PR has been removed now because it is no longer
needed because of the switch to LcfWidgetBinding.

src/ui/common/rpg_combobox.h

@@ -49,9 +49,6 @@ public slots:
 		QObject::connect(diag, SIGNAL(valueSelected(int)), this, SLOT(indexChanged(int)));
 	}
 
-signals:
-	void currentIndexChanged(int);
-
 protected:
 	QComboBox* m_comboBox;
 };
@@ -104,7 +101,6 @@ class RpgComboBox : public RpgComboBoxBase
 
 	void indexChanged(int index) override {
 		m_comboBox->setCurrentIndex(index);
-		emit currentIndexChanged(index);
 	};
 
 private:
@@ -148,8 +144,6 @@ RpgComboBox<LCF>::RpgComboBox(QWidget *parent, QAbstractItemModel *model) :
 		connect(dialog);
 		dialog->exec();
 	});
-
-	QObject::connect(m_comboBox, SIGNAL(currentIndexChanged(int)), this, SLOT(indexChanged(int)));
 }
 
 using ActorRpgComboBox = RpgComboBox<lcf::rpg::Actor>;