readline: fix remembered column in multiline #8423

Job	Run time
Build slim tarball	1m 29s
x86_64-darwin: with shared libraries	3h 22m 1s
x86_64-linux: with shared libraries	1h 32m 22s
aarch64-linux: Cache V8 build	27s
aarch64-darwin: with shared libraries	2h 21m 0s
aarch64-linux: with shared openssl-3.6.2	22m 37s
aarch64-linux: with shared openssl-1.1.1w	23m 11s
aarch64-linux: with shared openssl-3.5.7	23m 38s
aarch64-linux: with shared openssl-4.0.1	22m 45s
aarch64-linux: with shared openssl-3.0.21	23m 23s
aarch64-linux: with shared boringssl-0.20260526.0	23m 43s
	9h 36m 36s

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