fix: Collective event types with seats - hosts count towards the seat count

[Amit91848]

What does this PR do?

Fixes #14926

Before :

https://github.com/calcom/cal.com/assets/74371312/4dc9ddcd-0665-4bb9-b276-ab6aba69a1ab

After:

https://github.com/calcom/cal.com/assets/74371312/8260eead-658d-4413-9963-ad19d19ad07c

Type of change

• Bug fix (non-breaking change which fixes an issue)

Mandatory Tasks

• [x] Make sure you have self-reviewed the code. A decent size PR without self-review might be rejected.

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Graphite Automations

"Add community label" took an action on this PR • (05/07/24)

1 label was added to this PR based on Keith Williams's automation.

"Add consumer team as reviewer" took an action on this PR • (05/07/24)

1 reviewer was added to this PR based on Keith Williams's automation.

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