Web: Apply filter by unread state per team, not across teams

Description

Environment: 5.22 release and daily
Per discussion with Eric this can wait for next release.

Steps:
1) Enable new sidebar feature
2) Ensure you belong to at lease 2 teams
3) On first team, toggle on Filter by unread
4) Switch teams

Expected: Filter state saves per team and it does not persist across teams

Actual: Currently Filter applies to all the teams user belongs to.

QA Test Steps

None

Mana

None

Assignee

Unassigned

QA Assignee

None

Reporter

Jelena Gilliam

Fix versions

Mattermost Team

Apps

Sprint

None

Labels

None

QA Testing Areas

None

GitHub Issue

None

Components

None

Severity

None
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