Fixes the missing channel header in conversations.

quartz/src/main/java/com/vitorpamplona/quartz/events/Event.kt

@@ -62,7 +62,7 @@ open class Event(
 
     override fun toJson(): String = mapper.writeValueAsString(toJsonObject())
 
-    fun hasAnyTaggedUser() = tags.any { it.size > 1 && it[0] == "p" }
+    override fun hasAnyTaggedUser() = tags.any { it.size > 1 && it[0] == "p" }
 
     override fun taggedUsers() = tags.filter { it.size > 1 && it[0] == "p" }.map { it[1] }
     override fun taggedEvents() = tags.filter { it.size > 1 && it[0] == "e" }.map { it[1] }

quartz/src/main/java/com/vitorpamplona/quartz/events/EventInterface.kt

@@ -63,6 +63,8 @@ interface EventInterface {
     fun subject(): String?
     fun zapraiserAmount(): Long?
 
+    fun hasAnyTaggedUser(): Boolean
+
     fun taggedAddresses(): List<ATag>
     fun taggedUsers(): List<HexKey>
     fun taggedEvents(): List<HexKey>