fix: can unset network#proxy in the CLI config

[kittaakos]

Motivation

Users can alter the Manual proxy configuration IDE2 settings to No proxy.

Change description

An empty object ({}) must be used to correctly unset the CLI config value to its default.

Other information

Closes #2184

Reviewer checklist

• PR addresses a single concern.
• The PR has no duplicates (please search among the Pull Requests before creating one)
• PR title and description are properly filled.
• Docs have been added / updated (for bug fixes / features)

[per1234]

Unfortunately I find that #2184 still occurs when using the build from this PR (67e0d93). I'm following the same procedure as described in #2184.

I see this printed in the logs after I perform step (9) of the demonstration:

2023-08-22T14:56:19.478Z config INFO Updating daemon with 'data': {
  "board_manager": {
    "additional_urls": []
  },
  "build_cache": {
    "compilations_before_purge": 10,
    "ttl": "720h0m0s"
  },
  "daemon": {
    "port": "50051"
  },
  "directories": {
    "data": "c:\\Users\\per\\AppData\\Local\\Arduino15",
    "user": "c:\\Users\\per\\Documents\\Arduino"
  },
  "library": {
    "enable_unsafe_install": false
  },
  "locale": "en",
  "logging": {
    "file": "",
    "format": "text",
    "level": "info"
  },
  "metrics": {
    "addr": ":9090",
    "enabled": true
  },
  "network": {},
  "output": {
    "no_color": false
  },
  "sketch": {
    "always_export_binaries": false
  },
  "updater": {
    "enable_notification": true
  }
}

[kittaakos]

Blocked by arduino/arduino-cli#2275

[kittaakos]

It will be part of #2334.

Closing as a duplicate