Read byteOffset for detached buffers

Read byteOffset for detached buffers

The spec [1] expects to read `byteOffset` even for detached buffers.

Noticed a new test262 test [2] failed and there an an existing one we skipped
as well for the same reason.

[1] https://tc39.es/ecma262/#sec-%typedarray%.prototype.subarray
[2] https://github.com/tc39/test262/blob/main/test/built-ins/TypedArray/prototype/subarray/byteoffset-with-detached-buffer.js

Fix: https://github.com/bellard/quickjs/issues/417