Context

This tiny MR removes a useless function in the protocol: Script_typed_ir.comparable_option_t which is a special case of Script_typed_ir.option_t.

Manually testing the MR

I don't think there is anything to test.

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)
n/a 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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