Minor improvements to monitor_dbus_python.py script #904

Job	Run time
python-checks (black python3-isort , fedora:41, make -f Makefile fmt-travis)	10m 9s
python-checks (pylint python3-dbus python3-dbus-python-client-gen python3-justbytes python3-gobje...	7m 43s
python-checks (yamllint, fedora:41, make -f Makefile yamllint)	1m 48s
	19m 40s

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