fix: freeze page with gallery #805
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Quando si aveva abilitata l'opzione "updateSideMenuOnLoadingBlocks" per una vista di un content-type, se veniva mostrata una gallery con molti elementi la pagina si freezzava e il browser si impallava perchè il mutation observer veniva reinizializzato di continuo a causa probabilmente dei continui rerender del componente della gallery.
Togliendo la prop "subtree" all'observe dell'observer gli diciamo di rimanere in ascolto solamente i suoi figli diretti (che è quello che a noi interessa per costruire i titoli del menu laterale"