Mattermost-server: Tap size of 'more unreads' button in sidebar

[mattermod]

Proposed UI Changes

Figma working file: https://www.figma.com/file/bgPUKlqCSmgcuRtAykwCZx/MM-22945-More-Unreads-Button-Quick-Wins?node-id=0%3A1

• Changed rounded corner style to better match existing UI and to be more inline with the new standard button style
• Moved the arrow icon to the left to be more inline with new standard button style
• Increased button size to 40px in height for better tapability

Light

Dark

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JIRA: https://mattermost.atlassian.net/browse/MM-22945

[hanzei]

@esethna Same here

[rakhi2104]

I'm working on this.