do not focus input on mobile

[szaimen]

Follow-up to #8058

Regression of #4333

🖼️ Screenshots

🏚️ Before	🏡 After
B	A

🚧 TODO

• ...

🏁 Checklist

• ⛑️ Tests (unit and/or integration) are included
• 📘 API documentation in docs/ has been updated or is not required
• 📗 User documentation in https://github.com/nextcloud/documentation/tree/master/user_manual/talk has been updated or is not required
• 🔖 Capability is added or not needed

For my own testing

docker run -it \
--name nextcloud-easy-test \
-p 8443:443 \
-e TRUSTED_DOMAIN=192.168.24.128 \
--volume="nextcloud_easy_test_npm_cache_volume:/var/www/.npm" \
-e TALK_BRANCH=fix/noid/mobile-focus \
ghcr.io/szaimen/nextcloud-easy-test:latest

[szaimen]

Tested and works. Ready for review 👍

[szaimen]

Rebased