More Unreads button should not be displayed when Filtered by Unread on the new Experimental Sidebar

Description

Repro steps:
1. Enable the experimental sidebar and disable the unread filter if necessary
2. Have enough channels in the channel sidebar that it fills the height of the sidebar
3. Have a user DM you
4. Scroll the sidebar so that the unread DM is off the bottom of the screen and the More Unreads indicator appears at the bottom of the sidebar
5. Click on the unread filter to turn it on

Observed: The More Unreads indicator at the bottom of the list doesn't disappear. Clicking on it does nothing.
Expected: The More Unreads indicator disappears after the filter has been enabled.

QA Test Steps

See description

Mana

None

Assignee

Harrison Healey

QA Assignee

Rohitesh Gupta

Reporter

Rohitesh Gupta

Epic Link

None

Fix versions

Mattermost Team

Apps

Sprint

None

Labels

QA Testing Areas

LHS

GitHub Issue

None

Components

None

Severity

S3_minor_issue
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