fix: string field with false value in asconfig.js #4599

Job	Run time
Check	6s
Runtimes	54s
Features	37s
Bootstrap (debug)	9m 12s
Compiler (ubuntu, node current)	3m 2s
Bootstrap (release)	10m 37s
Loader	34s
Compiler (ubuntu, node lts_latest)	3m 40s
Compiler (macos, node current)	3m 10s
Compiler (macos, node lts_latest)	3m 34s
Compiler (windows, node current)	5m 57s
Compiler (windows, node lts_latest)	4m 5s
	45m 28s

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