FE: Add whitespace after readonly cluster name tag

[trvrnrth]

What changes did you make? (Give an overview)
Add whitespace after the readonly tag next to the cluster name in the dashboard. Follows the approach taken for the internal tag on topics:

kafka-ui/frontend/src/components/Topics/List/TopicTitleCell.tsx

Line 20 in 3c1fd1f

 

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