manager: remove LastUpdateTime default

common/time.py

@@ -1,7 +1,7 @@
 import datetime
 from pathlib import Path
 
-_MIN_DATE = datetime.datetime(year=2024, month=3, day=30)
+_MIN_DATE = datetime.datetime(year=2024, month=8, day=26)
 
 def min_date():
   # on systemd systems, the default time is the systemd build time

system/manager/manager.py

@@ -41,8 +41,6 @@ def manager_init() -> None:
     ("OpenpilotEnabledToggle", "1"),
     ("LongitudinalPersonality", str(log.LongitudinalPersonality.standard)),
   ]
-  if not PC:
-    default_params.append(("LastUpdateTime", datetime.datetime.now(datetime.UTC).replace(tzinfo=None).isoformat().encode('utf8')))
 
   if params.get_bool("RecordFrontLock"):
     params.put_bool("RecordFront", True)