Inconsistent CSV output

Bug Description

The way the CSV output is configured differs between endpoints. Sometimes fields are quoted with double-quotes (/elements/count) and s.t. not (/elements/count/groupBy/boundary) E.g.:

elements/count/

curl -X GET "https://api.ohsome.org/v1/elements/count?bboxes=8.67%2C49.39%2C8.71%2C49.42&filter=type%3Away%20and%20natural%3D*&format=csv&time=2014-01-01%2F2017-01-01%2FP1Y" -H  "accept: application/json"

# Copyright URL: https://ohsome.org/copyrights
# Copyright Text: © OpenStreetMap contributors
# API Version: 1.6.3
timestamp;value
"2014-01-01T00:00:00Z";"42.0"
"2015-01-01T00:00:00Z";"42.0"
"2016-01-01T00:00:00Z";"43.0"
"2017-01-01T00:00:00Z";"43.0"

elements/count/groupBy/boundary

curl -X GET "https://api.ohsome.org/v1/elements/count/groupBy/boundary?bboxes=8.67%2C49.39%2C8.71%2C49.42&filter=type%3Away%20and%20natural%3D*&format=csv&time=2014-01-01%2F2017-01-01%2FP1Y" -H  "accept: application/json"

# Copyright URL: https://ohsome.org/copyrights
# Copyright Text: © OpenStreetMap contributors
# API Version: 1.6.3
timestamp;boundary1
2014-01-01T00:00:00Z;42.0
2015-01-01T00:00:00Z;42.0
2016-01-01T00:00:00Z;43.0
2017-01-01T00:00:00Z;43.0

General Information

Please include the following general information about the issue and list any additional steps needed to reproduce the bug.

Version of the ohsome API : v1.6.3
Which API instance was requested: https://api.ohsome.org/v1`
Affected endpoint(s) /elements/count and /elements/count/groupbBy/boundary may be more
URL of your request (and request body if applicable): see above
Used HTTP method [GET or POST]: see above
Utilized tool/library for the request [e.g. cURL, Postman, ohsome-py, etc.]: see above

Expected Behaviour

Expected is that all ohsomeAPI CSV output follows the same encoding

Further Information

Error Messages, Logs, Screenshots

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Additional Information

Add any other further information about the problem here.

Notes

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GIScience / ohsome-api