stream: fix isErrored/isWritable for WritableStreams #1322

Job	Run time
Build slim tarball	1m 27s
x86_64-darwin: with shared libraries	30m 27s
aarch64-darwin: with shared libraries	27m 34s
x86_64-linux: with shared libraries	30m 18s
aarch64-linux: with shared libraries	30m 15s
	2h 0m 1s

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