Fix audit loading from the env and consider enable env variable (#9467)
Fix audit loading from the env and consider enable env variable (#9467)

Audit was not working properly when enabled from the environment
caused by a typo in the code.

This commit fixes that but also consider the following variables:
  `MINIO_LOGGER_WEBHOOK_ENABLE_*` and 
`MINIO_AUDIT_WEBHOOK_ENABLE_*` so the user can use 
this latter to temporarily disable a logger or audit configuration.

krisis/minio,aead/minio,aead/minio,vadmeste/minio,donatello/minio,vadmeste/minio,aead/minio,harshavardhana/minio,NitishT/minio,aead/minio,fwessels/minio,NitishT/minio,balamurugana/minio,aead/minio,harshavardhana/minio,fwessels/minio,aead/minio,harshavardhana/minio,fwessels/minio,harshavardhana/minio,minio/minio,aead/minio,harshavardhana/minio,harshavardhana/minio,aead/minio,balamurugana/minio,NitishT/minio,donatello/minio,minio/minio,harshavardhana/minio,krisis/minio,fwessels/minio,harshavardhana/minio,NitishT/minio