## 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/person_query.py
"Returns person table fields this query exposes"
        return [alias for column_name, alias in self._get_fields()]
    @property
    def is_used(self):
        "Returns whether properties or any other columns are actually being queried"
        if any(self._uses_person_id(prop) for prop in self._filter.property_groups.flat):
            return True
        for entity in self._filter.entities:
            if entity.math in COUNT_PER_ACTOR_MATH_FUNCTIONS or any(
                self._uses_person_id(prop) for prop in entity.property_groups.flat
            ):
                return True
        return len(self._column_optimizer.person_columns_to_query) > 0
    def _uses_person_id(self, prop: Property) -> bool:
        return prop.type in ("person", "static-cohort", "precalculated-cohort")
    def _get_fields(self) -> List[Tuple[str, str]]: