stream: fix isErrored/isWritable for WritableStreams #1324

Job	Run time
Build slim tarball	1m 18s
aarch64-linux: with shared libraries	33m 17s
x86_64-linux: with shared libraries	36m 54s
x86_64-darwin: with shared libraries	2h 11m 49s
aarch64-darwin: with shared libraries	23m 57s
	3h 47m 15s

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