Fix Qt 6 definition of macro ‘Q_DECLARE_MOVABLE_CONTAINER’

adding #include <QHash>

+ code fail to compile if it uses deprecated APIs.
=> see .pro file

sources/dataBase/ui/elementquerywidget.h

@@ -20,6 +20,7 @@
 
 #include <QWidget>
 #include <QButtonGroup>
+#include <QHash>
 
 class QListWidgetItem;