Influxdb 2.1.1 v1 auth create only uses the last Bucket of stringArray

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I am using influx 2.1 on Docker and trying to create a v1 user for access multiple Buckets but only the last one in an read oder write array is used. The first one(s) are ignored.

```
# influxd version
InfluxDB 2.1.1 (git: 657e1839de) build_date: 2021-11-09T03:03:48Z

# influx v1 auth create --read-bucket 0163a2bad970198b --write-bucket b12eadad7ed49a1f --read-bucket b12eadad7ed49a1f --write-bucket 0163a2bad970198b --username example

# influx v1 auth list
ID Description Username v2 User Name v2 User ID Permissions
08eefba1b1e17000 example admin 08d5468d88a48000 [read:orgs/23b79a7c9985f81a/buckets/b12eadad7ed49a1f read:orgs/23b79a7c9985f81a/buckets/b12eadad7ed49a1f write:orgs/23b79a7c9985f81a/buckets/0163a2bad970198b write:orgs/23b79a7c9985f81a/buckets/0163a2bad970198b]
```

Start by reproducing the `influx v1 auth create` command against InfluxDB 2.1.1 in Docker, then trace the v1 auth create handling for repeated `--read-bucket` and `--write-bucket` arguments. Done means the created authorization lists every specified read and write bucket rather than only the last one.

Written by the indexing model from the issue text.