Make sure to log unhandled errors always (#6784)

In many situations, while testing we encounter
ErrInternalError, to reduce logging we have
removed logging from quite a few places which
is acceptable but when ErrInternalError occurs
we should have a facility to log the corresponding
error, this helps to debug Minio server.

cmd/encryption-v1.go

@@ -1062,7 +1062,7 @@ func DecryptCopyObjectInfo(info *ObjectInfo, headers http.Header) (apiErr APIErr
 		}
 		var err error
 		if info.Size, err = info.DecryptedSize(); err != nil {
-			apiErr = toAPIErrorCode(err)
+			apiErr = toAPIErrorCode(context.Background(), err)
 		}
 	}
 	return