refactor: use {Read,Write}BE32
helpers for BIP32 nChild (de)serialization
#23199
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This small refactoring PR replaces manual bit-fiddling (de)serialization of the BIP32 child number (nChild) by the helpers
ReadBE32
/WriteBE32
. Note that those were first introduced in #4100, almost one year after the BIP32 derivation implementation has been merged (#2829, eb2c999).