## Bug description

Monthly Active Users metric seems wrong when choosing "# Number" as chart type.

Number: 
![image](https://user-images.githubusercontent.com/513669/201980874-be7d9c0d-5c9c-4c1e-955c-ea4143c84061.png)

Line chart: 
![image](https://user-images.githubusercontent.com/513669/201980986-b17af929-84e5-4f6a-b7f8-23b7ac8bedbc.png)

**490 != 70**

## How to reproduce

1. Create a new insight using any event and the "Monthly active users" metric
2. Date range = This month + Grouped by = Day
3. Choose chart type as Number => remember value
4. Change chart type as Linear => check last data point

=> the 2 values do not match
=> in other words there's a diff between a total aggregation and an aggregation per bucket of time ?

## Environment

- [x] PostHog Cloud
posthog/queries/trends/sql.py
{null_person_filter}
    )
    GROUP BY {event_sessions_table_alias}.$session_id, day_start, breakdown_value
)
GROUP BY day_start, breakdown_value
"""
BREAKDOWN_CUMULATIVE_INNER_SQL = """
SELECT
    {aggregate_operation} as total,
    {interval_annotation}(toTimeZone(toDateTime(timestamp, 'UTC'), %(timezone)s) {start_of_week_fix}) as day_start,
    breakdown_value
FROM (
    SELECT
        person_id,
        min(timestamp) as timestamp,
        breakdown_value
    FROM (
        SELECT
        {person_id_alias}.person_id as person_id,
        timestamp,
        {breakdown_value} as breakdown_value
        FROM
        events e
        {person_join}
        {groups_join}
        {sessions_join}
        {breakdown_filter}
        {null_person_filter}
    )
    GROUP BY person_id, breakdown_value