Server: Infinite newlines during chat on server webpage

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For certain models, the chat causes infinite newlines after a few turns. I had specifically observed while using Blue-Orchid-2x7b-Q5_K_M that was quantized from here. The infinite newlines are caused after 5 turns for this particular model.

This is a regression caused by PR #6127 . I verified that reverting the commit from that PR fixes the problem.