llamacpp wrong default value passed for `f16_kv` (#3320)
Fixes default f16_kv value in llamacpp; corrects incorrect parameter
passed.
See:
https://github.com/abetlen/llama-cpp-python/blob/ba3959eafd38080f3bf3028746406f350a8ef793/llama_cpp/llama.py#L33
Fixes #3241
Fixes #3301
