@default-format not correctly displayed in help output

[greg-1-anderson]

Steps to reproduce

Add @default-format: table to a command that does not define any @field-labels. Run help on that command.

Expected behavior

Help should say:

--format[=FORMAT]  Format the result data. ... [default: "table"]

Actual behavior

Help says:

--format[=FORMAT]  Format the result data. ... [default: "yaml"]

Note that the default from help overrides the default in @default-format when you run the command as well, so this bug effectively disables the @default-format annotation.