Channel name doesn't have channel string in `chrome://settings/help`

Test plan

1. Be on beta / dev / nightly (with 0.66.x or newer) on macOS
2. Visit chrome://settings/help
3. Verify channel name shows next to version. For example:

Description

/Applications/Brave\ Browser\ Nightly.app/Contents/Info.plist doesn’t have KSChannelID key.

It is set by brave_app_list target in brave/BUILD.gn and only channel key is omitted. Others are set properly. This could cause many side-effect because of wrong channel.

brave_tweak_info_plist("brave_app_plist") {
    info_plist = "$root_gen_dir/chrome/chrome_app_plist_tweaked.plist"

    args = [
      "--brave_channel=" + brave_channel,
      "--brave_product_dir_name=" + brave_product_dir_name,
      "--brave_feed_url=" + brave_feed_url,
      "--brave_dsa_file=" + brave_dsa_file,
    ]

    deps = [
      "//chrome:chrome_app_plist",
    ]
  }

Only reproduced in nightly channel for now. I think the reason why this only happens in nightly is other channels are not yet release after we bumped cr version.

[bsclifton]

Removed verification labels - since we’ll have a 0.65.x hotfix (Chromium version) we can re-verify the fixes with an RC 😄

[btlechowski]

Moving back to 0.66.x as it is beta/dev/nighly only issue.