Add serverId to SubEvent model

Author: antweb

libpretixsync/src/main/java/eu/pretix/libpretixsync/models/SubEvent.kt

@@ -6,6 +6,7 @@ import java.time.OffsetDateTime
 
 data class SubEvent(
     val id: Long,
+    val serverId: Long,
     val name: String,
     val dateFrom: OffsetDateTime,
     val dateTo: OffsetDateTime? = null,

libpretixsync/src/main/java/eu/pretix/libpretixsync/models/db/SubEventExtensions.kt

@@ -13,6 +13,7 @@ fun SubEvent.toModel(): SubEventModel {
 
     return SubEventModel(
         id = this.id,
+        serverId = this.server_id!!,
         name = parseName(json),
         // Use date values from JSON, as they contain time zone information
         dateFrom = SafeOffsetDateTimeMapper.decode(json, "date_from")!!,