Simplify the management of inReplyToEventTimelineItem

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/room/RustMatrixRoom.kt

@@ -139,6 +139,7 @@ class RustMatrixRoom(
         roomCoroutineScope.cancel()
         innerRoom.destroy()
         roomListItem.destroy()
+        inReplyToEventTimelineItem?.destroy()
     }
 
     override val name: String?
@@ -272,13 +273,6 @@ class RustMatrixRoom(
         }
     }
 
-    override suspend fun exitReplyMode(): Result<Unit> = withContext(roomDispatcher) {
-        runCatching {
-            inReplyToEventTimelineItem?.destroy()
-            inReplyToEventTimelineItem = null
-        }
-    }
-
     override suspend fun replyMessage(eventId: EventId, body: String, htmlBody: String?): Result<Unit> = withContext(roomDispatcher) {
         runCatching {
             val inReplyTo = inReplyToEventTimelineItem ?: innerRoom.getEventTimelineItemByEventId(eventId.value)