Update event_people.sparql

[LibrErli]

• This query returns currently also organization. P664 is allowed both for people and organizations. so i added the P31 Q5 in the inner query.
• i added a second speaker sub-query for speaker of an event inferred from presentation-items.

Example for both changes: #vBIB23 https://scholia.toolforge.org/event/Q120378280

Fixes # (issue number, if applicable)

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[fnielsen]

Do we have an example for ?person wdt:P31 wd:Q5.?