Preserve custom query parameters in influxdb_v2 output

[glinton]

Use Case

Set a custom query parameter in a url:

[[outputs.influxdb_v2]]
  urls = ["http://127.0.0.1:8086?id=abc"]

Expected behavior

I expect the query parameter to be preserved at the destination.
/api/v2/write?id=abc&bucket=bkt&org=org

Actual behavior

Only the bucket/org parameters are set.
/api/v2/write?bucket=bkt&org=org

Additional info

Modifying this line to instead initialize params with the values from the URL (loc) should preserve the parameters while still ensuring bucket and org are set properly.

telegraf/plugins/outputs/influxdb_v2/http.go

Line 430 in c7446f7

params := url.Values{}

-       params := url.Values{}
+       params := loc.Query()