Web: Private channels do not appear in channel link autocomplete

Description

Environment: Firefox/Mac on community-daily

Repro steps:
1) Create a private channel named `privatechannel`
2) In the post textbox, type `~priv`

Observed: No autocomplete entry appears for `~privatechannel` or any other private channel
Expected: An autocomplete entry appears for `~privatechannel`

QA Test Steps

See description

Status

Mana

None

Assignee

Unassigned

Reporter

Harrison Healey

Epic Link

None

Fix versions

Mattermost Team

UX

Sprint

None

Labels

None

GitHub Issue

None

QA Testing Areas

Messages