live-preview: Use production code in test #15594

Job	Run time
cpp_test_driver (ubuntu-22.04)	6m 34s
cpp_cmake (ubuntu-22.04)	6m 37s
android	1m 41s
cpp_test_driver (macos-12)	5m 55s
build_and_test (ubuntu-22.04, stable)	17m 44s
cpp_cmake (macos-12)	13m 14s
cpp_test_driver (windows-2022)	8m 38s
build_and_test (ubuntu-22.04, 1.73)	14m 53s
cpp_cmake (windows-2022)	8m 9s
build_and_test (macos-12, stable)	24m 57s
esp-idf-quick	8m 45s
build_and_test (windows-2022, stable)	22m 30s
ffi_32bit_build	1m 5s
fmt_test	1m 45s
build_and_test (windows-2022, 1.73)	22m 7s
mcu (pico-st7789, thumbv6m-none-eabi)	43s
build_and_test (windows-2022, beta, --exclude ffmpeg --exclude gstreamer-player)	21m 21s
mcu (stm32h735g, thumbv7em-none-eabihf)	50s
mcu_esp	2m 25s
miri	52s
node_test (ubuntu-22.04)	2m 51s
python_test (ubuntu-22.04)	1m 53s
node_test (macos-12)	10m 29s
uefi-demo	38s
python_test (macos-12)	1m 40s
updater_test (0.3.0)	1m 48s
node_test (windows-2022)	14m 41s
python_test (windows-2022)	2m 55s
docs / docs	8m 21s
tree-sitter / tree-sitter-tests	9s
wasm / wasm	4m 5s
wasm_demo / wasm_demo	17m 55s
wasm / build-slintpad	54s
wasm / lint-slintpad	25s
cpp_package_test	2m 42s
	4h 22m 11s

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