Fixed issue tetanus vaccination

app/Resources/EventParticipantResource.php

@@ -52,6 +52,7 @@ class EventParticipantResource extends JsonResource
                 'swimmingPermission' => $this->resource->swimmingPermission()->first()->short,
                 'extendedFirstAid' => $this->resource->firstAidPermission()->first()->name,
                 'tetanusVaccination' => $this->resource->tetanus_vaccination?->format('d.m.Y') ?? 'Unbekannt',
+                'tetanusVaccinationEdit' => $this->resource->tetanus_vaccination?->format('Y-m-d') ?? null,
                 'presenceDays' => ['real' => $presenceDays, 'support' => $presenceDaysSupport],
                 'participationType' => ParticipationType::where(['slug' => $this->resource->participation_type])->first()->name,
                 'needs_payment' => $this->resource->amount->getAmount() > 0 && $event->pay_direct && $this->resource->amount_paid?->getAmount() < $this->resource->amount->getAmount(),