secp256k1_scalar_set_int, but missed instances which were directly initialized via SECP256K1_SCALAR_CONST (found via git grep "SECP256K1_SCALAR_CONST(0,").
secp256k1_scalar_{zero,one} constants (part 2)
#1391
secp256k1_scalar_set_int, but missed instances which were directly initialized via SECP256K1_SCALAR_CONST (found via git grep "SECP256K1_SCALAR_CONST(0,").