Describe the bug

When authenticated to a GitHub Enterprise Server and running the gh api user command, it always tries to connect to api.github.com rather than my Enterprise Server.

$ gh --version
gh version 1.0.0 (2020-09-16)
https://github.com/cli/cli/releases/tag/v1.0.0

Steps to reproduce the behavior

1. Run the command gh api user
2. The following output is displayed

$ gh api user
error connecting to api.github.com
check your internet connection or githubstatus.com

3. See error above.
   Note: I get the above error connecting to api.github.com as my proxy server setting is not set. But it should not be connecting to api.github.com it should be connecting to https://my.enterprise.server/api

Expected vs actual behavior

I would expect it to connect to my enterprise server (https://my.enterprise.server/api) as the gh auth status shows:

$ gh auth status
my.enterprise.server
  Ô£ô Logged in to my.enterprise.server as mzzmjd (~/.config/gh/hosts.yml)
  Ô£ô Git operations for my.enterprise.server configured to use https protocol.

Logs

$ gh auth status
my.enterprise.server
  Ô£ô Logged in to my.enterprise.server as mzzmjd (~/.config/gh/hosts.yml)
  Ô£ô Git operations for my.enterprise.server configured to use https protocol.

$ gh api user
error connecting to api.github.com
check your internet connection or githubstatus.com