Search: Don't focus ChatInput for /dm/groups/... routes

[mrozanski]

Since the nav bars of groups and talk were combined, when viewing a Group Chat using the Messages tab on desktop, the ChatChannel view does't recognize the search route if the Search button is clicked. In this case, the URL has a "/dm/groups" portion (instead of "/groups" as when in the Groups nav tab). Chat input should not be focused in those cases to allow the search input to be used.

Fixes LAND-1577

Tested locally with livenet ship

PR Checklist

• Includes changes to desk files
• Describes how you tested the PR locally (test ship vs livenet)
• If a new feature, includes automated tests
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[linear]

LAND-1577 groups: unable to focus search input on desktop