[#117] Fix FrostFS interface usage

HTTP Gateway expects io.Reader to work with
payload, however `WithPayload` flag reads whole
payload into header object.

Signed-off-by: Alex Vanin <a.vanin@yadro.com>

internal/handler/reader.go

@@ -59,9 +59,7 @@ func (h *Handler) receiveFile(ctx context.Context, req request, objectAddress oi
 		PrmAuth: PrmAuth{
 			BearerToken: bearerToken(ctx),
 		},
-		Address:     objectAddress,
-		WithHeader:  true,
-		WithPayload: true,
+		Address: objectAddress,
 	}
 
 	rObj, err := h.frostfs.ReadObject(ctx, prm)