## Bug description

When calculating Trends results with an aggregated (e.g. single output, like big number) display type, WAU/MAU don't work. This is because we have an `ACTIVE_USERS_SQL` query for time series display types, but we don't have a version of this for aggregated display types. (See ZEN-1043.)

## How to reproduce

1. Create an insight with a single WAU or MAU series.
2. Switch display type to "Number".
3. Open the "Debug ClickHouse queries" modal from the command palette.
4. See `COUNT(*)` instead of `COUNT(DISTINCT person_id)`.

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posthog/queries/trends/breakdown.py
"actions_query": "AND {}".format(action_query) if action_query else "",
            "event_filter": "AND event = %(event)s" if not action_query else "",
            "filters": prop_filters,
            "null_person_filter": f"AND e.person_id != toUUIDOrZero('')" if self.using_person_on_events else "",
        }
        _params, _breakdown_filter_params = {}, {}
        if self.filter.breakdown_type == "cohort":
            _params, breakdown_filter, _breakdown_filter_params, breakdown_value = self._breakdown_cohort_params()
        else:
            aggregate_operation_for_breakdown_init = (
                "count(*)"
                if self.entity.math == "dau" or self.entity.math in COUNT_PER_ACTOR_MATH_FUNCTIONS
                else aggregate_operation
            )
            _params, breakdown_filter, _breakdown_filter_params, breakdown_value = self._breakdown_prop_params(
                aggregate_operation_for_breakdown_init, math_params
            )
        if len(_params["values"]) == 0:
            
            
            
            
            return ("SELECT [now()] AS date, [0] AS data, '' AS breakdown_value LIMIT 0", {}, lambda _: [])
        person_join_condition, person_join_params = self._person_join_condition()
        groups_join_condition, groups_join_params = self._groups_join_condition()
        sessions_join_condition, sessions_join_params = self._sessions_join_condition()
        self.params = {**self.params, **_params, **person_join_params, **groups_join_params, **sessions_join_params}
        breakdown_filter_params = {**breakdown_filter_params, **_breakdown_filter_params}
        if self.filter.display in NON_TIME_SERIES_DISPLAY_TYPES:
            breakdown_filter = breakdown_filter.format(**breakdown_filter_params)