fix: display help with correct default values

[sebastien-prudhomme]

Description

This PR fixes help displayed

The help is now displayed with the correct default values:

GLOBAL OPTIONS:
   --f16                          (default: false) [$F16]
   --debug                        (default: false) [$DEBUG]
   --cors                         (default: false) [$CORS]
   --cors-allow-origins value      [$CORS_ALLOW_ORIGINS]
   --threads value                Number of threads used for parallel computation. Usage of the number of physical cores in the system is suggested. (default: 4) [$THREADS]
   --models-path value            Path containing models used for inferencing (default: "/build/models") [$MODELS_PATH]
   --preload-models value         A List of models to apply in JSON at start [$PRELOAD_MODELS]
   --preload-models-config value  A List of models to apply at startup. Path to a YAML config file [$PRELOAD_MODELS_CONFIG]
   --config-file value            Config file [$CONFIG_FILE]
   --address value                Bind address for the API server. (default: ":8080") [$ADDRESS]
   --image-path value             Image directory [$IMAGE_PATH]
   --backend-assets-path value    Path used to extract libraries that are required by some of the backends in runtime. (default: "/tmp/localai/backend_data") [$BACKEND_ASSETS_PATH]
   --context-size value           Default context size of the model (default: 512) [$CONTEXT_SIZE]
   --upload-limit value           Default upload-limit. MB (default: 15) [$UPLOAD_LIMIT]
   --help, -h                     show help

Notes for Reviewers

Signed commits

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[mudler]

nice cleanup!