Fixed WebUI probe problem found by @Rocco #694

Job	Run time
tests (ubuntu-latest, tests)	50s
build (ubuntu-latest, noradio)	2m 1s
tests (macos-latest, tests)	32s
build (ubuntu-latest, wifi)	2m 16s
tests (windows-latest, tests_nosan)	1m 28s
build (ubuntu-latest, bt)	2m 13s
build (macos-latest, noradio)	1m 27s
build (macos-latest, wifi)	1m 37s
build (macos-latest, bt)	1m 46s
build (windows-latest, noradio)	5m 20s
build (windows-latest, wifi)	8m 6s
build (windows-latest, bt)	5m 18s
	32m 54s

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