Context

Following discussion here, the bond id representation needs testing. Indeed there was one bug in there, and this is fixed here as well.

Manually testing the MR

Run dune exec ./src/proto_alpha/lib_protocol/test/unit/main.exe -- test Bond_id_repr

Document the interface of any function added or modified (see the coding guidelines)
Document any change to the user interface, including configuration parameters (see node configuration)
Provide automatic testing (see the testing guide).
For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
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