Makefile: Remove backup/restore of obsolete config directory (#2479)

Makefile

@@ -14,14 +14,12 @@ build:
 	docker build -t $(NAME) . --build-arg VCS_VER=$(VCS_VER) --build-arg VCS_REF=$(VCS_REF)
 
 backup:
-# if backup directories exist, clean hasn't been called, therefore
+# if backup directory exist, clean hasn't been called, therefore
 # we shouldn't overwrite it. It still contains the original content.
-	-@ [[ ! -d config.bak ]] && cp -rp config config.bak || :
 	-@ [[ ! -d testconfig.bak ]] && cp -rp test/config testconfig.bak || :
 
 clean:
-# remove running and stopped test containers
-	-@ [[ -d config.bak ]] && { rm -rf config ; mv config.bak config ; } || :
+# remove test containers and restore test/config directory
 	-@ [[ -d testconfig.bak ]] && { sudo rm -rf test/config ; mv testconfig.bak test/config ; } || :
 	-@ for container in $$(docker ps -a --filter name='^/mail$$|^ldap_for_mail$$|^mail_override_hostname$$|^mail_non_subdomain_hostname$$|^open-dkim$$|^hadolint$$|^eclint$$|^shellcheck$$|mail_changedetector.*' | sed 1d | cut -f 1-1 -d ' '); do docker rm -f $$container; done
 	-@ sudo rm -rf test/onedir test/alias test/quota test/relay test/config/dovecot-lmtp/userdb test/config/key* test/config/opendkim/keys/domain.tld/ test/config/opendkim/keys/example.com/ test/config/opendkim/keys/localdomain2.com/ test/config/postfix-aliases.cf test/config/postfix-receive-access.cf test/config/postfix-receive-access.cfe test/config/dovecot-quotas.cf test/config/postfix-send-access.cf test/config/postfix-send-access.cfe test/config/relay-hosts/chksum test/config/relay-hosts/postfix-aliases.cf test/config/dhparams.pem test/config/dovecot-lmtp/dh.pem test/config/relay-hosts/dovecot-quotas.cf test/config/user-patches.sh test/alias/config/postfix-virtual.cf test/quota/config/dovecot-quotas.cf test/quota/config/postfix-accounts.cf test/relay/config/postfix-relaymap.cf test/relay/config/postfix-sasl-password.cf test/duplicate_configs/