buffer: fix MAX_LENGTH constant export
This was a typo and accidentally returned the wrong value.
Fixes: https://github.com/nodejs/node/issues/14819 Ref: https://github.com/nodejs/node/pull/13467
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines
Affected core subsystem(s)
buffer