`config init` ignores the `--save-as` flag

[kittaakos]

Bug Report

Current behavior

When I try to initialize the default config file, the --save-as flag is ignored and config file will be created under ~/Library/Arduino15/arduino-config.yaml location.

Steps to reproduce:

akos.kitta@Akoss-MacBook-Pro build % ./arduino-cli version                                                   
arduino-cli Version: 0.7.1 Commit: 7668c46
akos.kitta@Akoss-MacBook-Pro build % ./arduino-cli config init --help                                        
Initializes a new configuration file into the default location ($EXE_DIR/cli-config.yml).
Usage:
  arduino-cli config init [flags]
Examples:
  # Creates a default configuration file into the default location.
  ./arduino-cli config init
Flags:
  -h, --help             help for init
      --save-as string   Sets where to save the configuration file [default is ./arduino-cli.yaml].
Global Flags:
      --additional-urls strings   Additional URLs for the board manager.
      --config-file string        The custom config file (if not specified the default will be used).
      --format string             The output format, can be [text|json]. (default "text")
      --log-file string           Path to the file where logs will be written.
      --log-format string         The output format for the logs, can be [text|json].
      --log-level string          Messages with this level and above will be logged.
  -v, --verbose                   Print the logs on the standard output.
akos.kitta@Akoss-MacBook-Pro build % ./arduino-cli config init --save-as ~/Documents/foo.yaml                
Config file written: /Users/akos.kitta/Library/Arduino15/arduino-cli.yaml
akos.kitta@Akoss-MacBook-Pro build % ./arduino-cli config init --save-as /Users/akos.kitta/Documents/foo.yaml
Config file written: /Users/akos.kitta/Library/Arduino15/arduino-cli.yaml

Expected behavior

Executing ./arduino-cli config init --save-as /Users/akos.kitta/Documents/foo.yaml creates the file under /Users/akos.kitta/Documents/foo.yaml

Environment

• CLI version (output of arduino-cli version):
  arduino-cli Version: 0.7.1 Commit: 7668c46
• OS and platform:
  macOS 10.15.1

Additional context