[heycam/webidl] Dictionary inclusion rules need to take record<> into account (#296)

Dictionaries are not supposed to contain themselves, directly or indirectly.  See the bit starting 

> The type of a dictionary member must not include the dictionary it appears on

under <https://heycam.github.io/webidl/#idl-dictionaries>.  This section walks through containers like sequences and frozen arrays, but _not_ `record<>`.  It should walk through those too.  Gecko gets this right with MozMap.

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