[heycam/webidl] No location for constants on callback interface (#539)

[3.6.6. Constants](https://heycam.github.io/webidl/#es-constants) describes the location of the property.  However, there is no case that applies to constants defined on legacy callback interface.  The first bullet describes the case of [Global].  The second bullet describes interface objects that have interface prototype object.  As legacy callback interface does not have interface prototype object, the second bullet doesn't apply.  Should we have the third bullet for legacy callback interface case?

FYI, 3.6.6. Constants is referenced from [3.6.4. Legacy callback interface object](https://heycam.github.io/webidl/#legacy-callback-interface-object).

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