don't spam endless posts when trying to schedule on GoToSocial (#4705)

closes #4703

app/src/main/java/com/keylesspalace/tusky/entity/ScheduledStatus.kt

@@ -25,3 +25,10 @@ data class ScheduledStatus(
     val params: StatusParams,
     @Json(name = "media_attachments") val mediaAttachments: List<Attachment>
 )
+
+// minimal class to avoid json parsing errors with servers that don't support scheduling
+// https://github.com/tuskyapp/Tusky/issues/4703
+@JsonClass(generateAdapter = true)
+data class ScheduledStatusReply(
+    val id: String,
+)