You are already a participant of this event
#### Description When joining an event as anonymous, no matter the e-mail, Mobilizon gives the error "You are already a participant of this event" #### Steps to Reproduce Having this in the config. ![image](/uploads/0a4099c0ec72c9f551750cd93d81e133/image.png) Opening event in incognito/private mode in the browser, pressing "Participate" and selecting "I don't have an account". #### Expected behaviour: That the anonymous user can join the event. #### Actual behaviour: Mobilizon gives the error "You are already a participant of this event". #### Reproduces how often: Every time. #### Versions * Mobilizon 3.0.0 * Waterfox G4.1.5 * Firefox Android * Chrome Android
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