## 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
VOLUME_SQL = """
SELECT {aggregate_operation} as data, {interval}(toTimeZone(toDateTime(timestamp, 'UTC'), %(timezone)s) {start_of_week_fix}) as date FROM ({event_query}) GROUP BY date
"""
VOLUME_AGGREGATE_SQL = """
SELECT {aggregate_operation} as data FROM ({event_query}) events
"""
VOLUME_PER_ACTOR_SQL = """
SELECT {aggregate_operation} AS data, date FROM (
    SELECT COUNT(*) AS intermediate_count, {aggregator}, {interval}(toTimeZone(toDateTime(timestamp, 'UTC'), %(timezone)s) {start_of_week_fix}) AS date
    FROM ({event_query})