Fix WebUI v3 ESP800 values #834

Job	Run time
tests (ubuntu-latest, tests)	30s
build (ubuntu-latest, noradio)	2m 7s
tests (macos-latest, tests)	41s
build (ubuntu-latest, wifi)	2m 21s
tests (windows-latest, tests_nosan)	1m 21s
build (ubuntu-latest, bt)	2m 16s
build (macos-latest, noradio)	1m 52s
build (macos-latest, wifi)	2m 5s
build (macos-latest, bt)	1m 42s
build (windows-latest, noradio)	4m 10s
build (windows-latest, wifi)	6m 42s
build (windows-latest, bt)	5m 35s
	31m 22s

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