test: Avoid intermittent failures in feature_init

Author: MarcoFalke

test/functional/feature_init.py

@@ -1,11 +1,10 @@
 #!/usr/bin/env python3
-# Copyright (c) 2021-2022 The Bitcoin Core developers
+# Copyright (c) 2021-present The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Stress tests related to node initialization."""
 import os
 from pathlib import Path
-from random import randint
 import shutil
 
 from test_framework.test_framework import BitcoinTestFramework, SkipTest
@@ -138,8 +137,8 @@ def check_clean_start():
                     # Since the genesis block is not checked by -checkblocks, the
                     # perturbation window must be chosen such that a higher block
                     # in blk*.dat is affected.
-                    tf.seek(randint (150, 15000))
-                    tf.write(b'1' * randint(20, 2000))
+                    tf.seek(150)
+                    tf.write(b"1" * 200)
 
             start_expecting_error(err_fragment)