Unable to Create Read/Write API Token for `_monitoring` Bucket

## About the bug

I am unable to create a token to provide read only (or read/write) access for the `_monitoring` bucket.

**Steps to reproduce:**
List the minimal actions needed to reproduce the behavior.

1. Log into InfluxDB 2.2.0 interface.
2. Click on "Data" then "API Tokens"
3. .Click "Generate API Token"
4. Click "Read/Write API Token"
5. Click "Scoped" (by default it's selected)
6. `_monitoring` bucket does not appear in list.

**Expected behavior:**

I would expect `_monitoring` (as well as `_tasks` and any other bucket that could be meaningfully observable by external systems) to be available to be selected.

**Actual behavior:**

The `_monitoring` bucket is not available to be selected when creating a read/write API token.

**Visual Proof:**


(please note, only the `testing` bucket is available to be selected, and not `_monitoring` or any other internal bucket)

## About your environment

**Environment info:**

Using InfluxDB 2.2.0 from Docker on Debian 10

**Config:**

Entirely plain-vanilla InfluxDB 2.2.0 from Docker.