Revert "test_onroad: use zstd compression (#33100)"

This reverts commit 4caecf2.

selfdrive/test/test_onroad.py

@@ -1,3 +1,4 @@
+import bz2
 import math
 import json
 import os
@@ -8,7 +9,6 @@
 import subprocess
 import time
 import numpy as np
-import zstd
 from collections import Counter, defaultdict
 from functools import cached_property
 from pathlib import Path
@@ -20,10 +20,9 @@
 from openpilot.common.timeout import Timeout
 from openpilot.common.params import Params
 from openpilot.selfdrive.controls.lib.events import EVENTS, ET
-from openpilot.selfdrive.test.helpers import set_params_enabled, release_only
 from openpilot.system.hardware import HARDWARE
+from openpilot.selfdrive.test.helpers import set_params_enabled, release_only
 from openpilot.system.hardware.hw import Paths
-from openpilot.system.loggerd.uploader import LOG_COMPRESSION_LEVEL
 from openpilot.tools.lib.logreader import LogReader
 
 """
@@ -167,10 +166,10 @@ def setup_class(cls):
     cls.log_sizes = {}
     for f in cls.log_path.iterdir():
       assert f.is_file()
-      cls.log_sizes[f] = f.stat().st_size / 1e6
+      cls.log_sizes[f]  = f.stat().st_size / 1e6
       if f.name in ("qlog", "rlog"):
         with open(f, 'rb') as ff:
-          cls.log_sizes[f] = len(zstd.compress(ff.read(), LOG_COMPRESSION_LEVEL)) / 1e6
+          cls.log_sizes[f] = len(bz2.compress(ff.read())) / 1e6
 
 
   @cached_property
@@ -207,7 +206,7 @@ def test_log_sizes(self):
       if f.name == "qcamera.ts":
         assert 2.15 < sz < 2.35
       elif f.name == "qlog":
-        assert 0.4 < sz < 0.5
+        assert 0.4 < sz < 0.6
       elif f.name == "rlog":
         assert 5 < sz < 50
       elif f.name.endswith('.hevc'):