Add "Location:" in response when creating bucket

according to "https://docs.aws.amazon.com/AmazonS3/latest/API/API_CreateBucket.html"

weed/s3api/s3api_bucket_handlers.go

@@ -135,6 +135,7 @@ func (s3a *S3ApiServer) PutBucketHandler(w http.ResponseWriter, r *http.Request)
 		s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)
 		return
 	}
+	w.Header().Set("Location", "/" + bucket)
 	writeSuccessResponseEmpty(w, r)
 }