MessageListScreen: Annotate sender in group chats

backend/src/main/java/net/buzzert/kordophone/backend/model/Conversation.kt

@@ -42,6 +42,9 @@ data class Conversation(
         }
     }
 
+    val isGroupChat: Boolean
+        get() = participants.count() > 1
+
     fun formattedDisplayName(): String {
         return displayName ?: participants.joinToString(", ")
     }

backend/src/main/java/net/buzzert/kordophone/backend/server/UpdateMonitor.kt

@@ -42,7 +42,7 @@ class UpdateMonitor(private val client: APIClient) : WebSocketListener() {
     fun beginMonitoringUpdates() {
         Log.d(UPMON_LOG, "Opening websocket connection")
         this.webSocket = client.getWebSocketClient(
-            serverPath = "/updates",
+            serverPath = "updates",
             queryParams = mapOf("seq" to messageSeq.toString()),
             listener = this
         )