Ignore double clicks on the divelist

Fixes #170 on GitHub

Simple catch function for double click events in the divelist,
prevents users from trying to edit the divenumber ithe wrong way.

Signed-off-by: Joakim Bygdell <j.bygdell@gmail.com>

desktop-widgets/divelistview.cpp

@@ -1034,3 +1034,8 @@ void DiveListView::updateLastImageTimeOffset(const int offset)
 	s.beginGroup("MainWindow");
 	s.setValue("LastImageTimeOffset", offset);
 }
+
+void DiveListView::mouseDoubleClickEvent(QMouseEvent * event)
+{
+	return;
+}