InfluxDB Import Timezone does not work as expected

__Steps to reproduce:__

1. ...use of the timezone module
2. `import "timezone"
option location = timezone.location(name: "Europe/Belfast")`

__Expected behavior:__
When using the timezone module, the existing data that is stored in UTC is not displayed in the local time as expected.
The data should be shown in local Time

__Actual behavior:__
The date are shown in UTC

__Environment info:__

* System info: Synology DSM 7
* InfluxDB 2.1.1
* Docker

__Config:__
`import "timezone"
option location = timezone.location(name: "Europe/Berlin")
from(bucket: "stromzaehler")
|> range(start: today())
|> filter(fn: (r) => r["_measurement"] == "stromzaehler")`

Start by reproducing the supplied Flux query with the timezone module and the Europe/Berlin or Europe/Belfast location against existing UTC data. Compare the returned timestamps with the expected local time; done means the configured timezone is applied consistently rather than the results remaining in UTC.

Written by the indexing model from the issue text.