Fix alignment of info log #11629

Environment

• Elixir & Erlang/OTP versions (elixir --version): Elixir 1.13.2, Erlang/OTP 24
• Operating system: mac

Current behavior

Only info log has two spaces between log_level and message.

require Logger

log_levels = [:debug, :info, :notice, :warning, :error, :critical, :alert, :emergency]

log_levels
|> Enum.each(&Logger.log(&1, "hi"))

21:08:12.477 [debug] hi

21:08:12.477 [info]  hi

21:08:12.477 [notice] hi

21:08:12.477 [warning] hi

21:08:12.477 [error] hi

21:08:12.477 [critical] hi

21:08:12.477 [alert] hi

21:08:12.477 [emergency] hi

I guess that is because of aligning logs when there was only debug, info, warn, error log levels exist, following the issue below.

#2610

Expected behavior

There is no reason to have two spaces in info log anymore.
warn became warning and other log levels longer than 5 chars were added. We can't align all of them.