commands: fix command matching for unused options

When a given command:

- matches command definition A based on required options,
  but uses optional options that are not accepted by A.

- matches command definition B based on required options,
  (but fewer required items than A), and uses no
  unaccepted optional options.

then B is the correct choice.  Command A would fail because
of the unaccepted optional options.  The logic was mistakenly
letting A win because it had a greater number of required option
matches, without accounting for the optional option mismatches.

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