[1.6.x] Keep `Template[0-22]` also for Scala 3 for <=22 params (backport #790) by @mkurz

[mergify[bot]]

No special test needed because everything gets tested already.

Handles following use case:

• https://github.com/orgs/playframework/discussions/12643

/cc @colin-lamed

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This is an automatic backport of pull request #790 done by Mergify.