Reset default_configuration after config_loader specs
Reset default_configuration after config_loader specs

[Fix #8548]

default_configuration needs to be cleared before ConfigLoader specs to clear
the general default.

It also needs to be cleared after ConfigLoader specs to clear the custom
configuration introduced in its isolated environment.

tdeo/rubocop,rrosenblum/rubocop,bbatsov/rubocop,jmks/rubocop,tejasbubane/rubocop,maxjacobson/rubocop,tdeo/rubocop,maxjacobson/rubocop,rrosenblum/rubocop,tejasbubane/rubocop,tejasbubane/rubocop,rrosenblum/rubocop,bbatsov/rubocop,jmks/rubocop,maxjacobson/rubocop,tdeo/rubocop,jmks/rubocop