ENV["HOME"] and Dir.home seems not to be equivalent

because Ruby 2.5 CI passes with the former but fails with the latter.
I don't want to introduce any new bug just for conforming RuboCop,
so let me disable the cop and revert the code back to what used to work.

This reverts 862c937 and partially
reverts 4480718.

.rubocop.yml

@@ -239,6 +239,9 @@ Style/DocumentDynamicEvalDefinition:
 Style/EndlessMethod:
   Enabled: true
 
+Style/EnvHome:
+  Enabled: false
+
 Style/ExplicitBlockArgument:
   # capturing as a proc has a performance hit, so is a case by case choice
   Enabled: false

lib/simplecov/load_global_config.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 require "etc"
-home_dir = Dir.home || File.expand_path("~") || Etc.getpwuid.dir || (ENV.fetch("USER", nil) && File.expand_path("~#{ENV.fetch('USER', nil)}"))
+home_dir = (ENV["HOME"] && File.expand_path("~")) || Etc.getpwuid.dir || (ENV["USER"] && File.expand_path("~#{ENV['USER']}"))
 if home_dir
   global_config_path = File.join(home_dir, ".simplecov")
   load global_config_path if File.exist?(global_config_path)