nixos/tests/home-assistant: stop printing log

With multiple specialization changes this isn't very helpful anymore,
but no biggie since we check the log for errors anyway and the log is
not too verbose anyway.

nixos/tests/home-assistant.nix

@@ -172,12 +172,8 @@ in {
       new_pid = hass.succeed("systemctl show --property=MainPID home-assistant.service")
       assert pid != new_pid, "The PID of the process shoudl change when the HA binary changes"
 
-    with subtest("Print log to ease debugging"):
-        output_log = hass.succeed("cat ${configDir}/home-assistant.log")
-        print("\n### home-assistant.log ###\n")
-        print(output_log + "\n")
-
     with subtest("Check that no errors were logged"):
+        output_log = hass.succeed("cat ${configDir}/home-assistant.log")
         assert "ERROR" not in output_log
 
     with subtest("Check systemd unit hardening"):