Dart

Use channel if channelfield is false #248

Job	Run time
build (packages/consoler)	45s
build (packages/dart_leap)	47s
build (packages/flutter_localizer)	47s
build (packages/localizer)	46s
build (packages/lw_file_system)	48s
build (packages/lw_file_system_api)	44s
build (packages/lw_sysapi)	1m 0s
build (packages/generate_leap)	48s
build (packages/material_leap)	55s
build (packages/networker/networker)	41s
build (packages/networker/networker_crypto)	42s
build (packages/networker/networker_rtc)	52s
build (packages/networker/networker_socket)	49s
build (packages/networker/networker_s5)	44s
	11m 8s

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