mp4box.js
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`ItemLocationBox` (`iloc`) `base_offset` field is incorrect
When loading clusterfuzz-testcase-minimized-avif-4914209301856256.avif.zip), the base_offset is reported as 18446744073709486000, but the 8 bytes starting at offset 118 are FFFF FFFF FFFF 000B which is 18446744073709486091 in base 10.
See ISOBMFF (ISO 14496-12:2020) § 8.11.3 for the details of the iloc box.
