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New lines can be an important part of a user's prompt and trimming
it can alter the results. We previously only trimmed prompts with
images but refactoring brought this behavior to all prompts, where
it became more noticable.

The /generate endpoint adds less whitespace and therefore doesn't
need to trim it out - this brings the same behavior to /chat.

Thanks to @gabe-l-hart for spotting the issue!

Fixes #7795