Resolve "Make emoji picker bigger"

What does this MR do?

The emoji picker shows 9 emoji for each row. On mobile devices the width is reduced to 7 emoji for each row.

Screenshots

on md and bigger devices:

on xs devices:

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer

Closes #50433 (closed)