Channel member dropdown doesn't show all offline members

Description

community-release.mattermost.com, mysql.test

Repro steps:
1. Use Reception channel or other channel with lots of users with different statuses (such as Town Square).
2. Click channel member icon.
3. Scroll down to the end of list of members and observe.

Observed:
List of offline members stops around letters K-M.

QA Test Steps

None

Status

Mana

None

Assignee

Andrew Brown

QA Assignee

None

Reporter

Amy Blais

Epic Link

None

Fix versions

Mattermost Team

UX

Labels

None

QA Testing Areas

None

GitHub Issue

None

Components

None
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