cleanup: use safe connect() in ConfigureDiveComputerDialog

The pointer-to-member-function version is compile-time checked
and therefore less risky with respect to refactoring.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

desktop-widgets/configuredivecomputerdialog.h

@@ -124,7 +124,7 @@ private:
 #endif
 };
 
-class OstcFirmwareCheck : QObject {
+class OstcFirmwareCheck : public QObject {
 	Q_OBJECT
 public:
 	explicit OstcFirmwareCheck(QString product);