fix: properly handle 'veg' services in booking edit flow

src/Service/BookingChangeTracker.php

@@ -96,6 +96,7 @@ class BookingChangeTracker
                 'skiPass' => $participant->skiPass?->id,
                 'courses' => $this->normalizeServiceArray($participant->courses),
                 'board' => $this->normalizeServiceArray($participant->board),
+                'veg' => $participant->veg?->id,
                 'rentals' => $this->normalizeServiceArray($participant->rentals),
                 'rentalInsurance' => $participant->rentalInsurance?->id,
                 'additionalServices' => $this->normalizeServiceArray($participant->additionalServices),