## 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/breakdown.py
if self.filter.breakdown_type == "session":
            if breakdown == "$session_duration":
                
                
                breakdown_value = f"{SessionQuery.SESSION_TABLE_ALIAS}.session_duration"
            else:
                raise ValidationError(f'Invalid breakdown "{breakdown}" for breakdown type "session"')
        elif (
            self.using_person_on_events
            and self.filter.breakdown_type == "group"
            and groups_on_events_querying_enabled()
        ):
            properties_field = f"group{self.filter.breakdown_group_type_index}_properties"
            breakdown_value, _ = get_property_string_expr(
                "events", breakdown, "%(key)s", properties_field, materialised_table_column=properties_field
            )
        elif self.using_person_on_events and self.filter.breakdown_type != "group":
            if self.filter.breakdown_type == "person":
                breakdown_value, _ = get_property_string_expr(
                    "events", breakdown, "%(key)s", "person_properties", materialised_table_column="person_properties"
                )
            else:
                breakdown_value, _ = get_property_string_expr("events", breakdown, "%(key)s", "properties")
        else:
            if self.filter.breakdown_type == "person":
                breakdown_value, _ = get_property_string_expr("person", breakdown, "%(key)s", "person_props")
            elif self.filter.breakdown_type == "group":
                properties_field = f"group_properties_{self.filter.breakdown_group_type_index}"
                breakdown_value, _ = get_property_string_expr(
                    "groups", breakdown, "%(key)s", properties_field, materialised_table_column="group_properties"