Ignore MokListTrusted events in ParseUEFIVariableAuthority

[malt3]

Fixes #283

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[ericchiang]

@brandonweeks asked for a chance to test this against some of our internal data. Broadly lgtm, but waiting on him

[twitchyliquid64]

Is it worth actually parsing this and exposing the data?

Otherwise, LGTM.

[malt3]

@brandonweeks if I understand the current state correctly, you wanted to perform tests against internal data. Is there any news or things I can do to help?

[ericchiang]

Approving since it looks like Brandon's a bit busy.

@brandonweeks please feel free to roll this back or follow up if you find any issues.