Server: use llama_chat_apply_template (#5593)
* server: use llama_chat_apply_template
* server: remove trailing space
* server: fix format_chat
* server: fix help message
Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
* server: fix formatted_chat
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Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>