fix(DOtherSide): Crash when a QSortFilterModel is collected by nim GC

QSortFilterModel can be used as sourceModel in proxy models. Proxy models rely on receiving the `QObject::destroyed` event when the source model is destroyed to clean the internal data.
Calling `QObject::disconnect` will also disconnect any connections to the `QObject::destroyed` event leaving dangling pointers in the proxy models.

vendor/DOtherSide/lib/src/DOtherSide.cpp

@@ -875,7 +875,6 @@ void dos_qvariant_setArray(::DosQVariant *vptr, int size, ::DosQVariant **array)
 void dos_qobject_delete(::DosQObject *vptr)
 {
     auto qobject = static_cast<QObject *>(vptr);
-    qobject->disconnect();
     delete qobject;
 }