Prefer compact coding in json_script

[mymedia2]

json.dumps() overrides ensure_ascii=False in DjangoJSONEncoder. Set the flag again. It is okay because JSON allows the use of Unicode characters only. Set separators without spaces as well.

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[felixxm]

@mymedia2 Thanks for this PR :+1: It's a new feature and all new features require an accepted ticket, please create one. Moreover it's backward incompatible so release notes are also needed (see a similar change, ticket-29249).

[felixxm]

Closing due to inactivity and lack of follow up.