quote QUuid values

Task-number: QTBUG-44480
Change-Id: I125ab913c867758d958a2774ad125533d6a07a83
Reviewed-by: Evgeniy Fominov <fm@stilsoft.ru>
Reviewed-by: Mark Brand <mabrand@mabrand.nl>

src/sql/drivers/psql/qsql_psql.cpp

@@ -1320,6 +1320,9 @@ QString QPSQLDriver::formatValue(const QSqlField &field, bool trimStrings) const
             }
             break;
         }
+        case QVariant::Uuid:
+            r = QLatin1Char('\'') + field.value().toString() + QLatin1Char('\'');
+            break;
         default:
             r = QSqlDriver::formatValue(field, trimStrings);
             break;