Show the bridge-bot avatar for bridged messages

Signed-off-by: Joas Schilling <coding@schilljs.com>

app/src/main/java/com/nextcloud/talk/models/json/chat/ChatMessage.java

@@ -285,6 +285,9 @@ public class ChatMessage implements MessageContentType, MessageContentType.Image
             public String getAvatar() {
                 if (getActorType().equals("users")) {
                     return ApiUtils.getUrlForAvatarWithName(getActiveUser().getBaseUrl(), actorId, R.dimen.avatar_size);
+                } else if (getActorType().equals("bridged")) {
+                    return ApiUtils.getUrlForAvatarWithName(getActiveUser().getBaseUrl(), "bridge-bot",
+                                                            R.dimen.avatar_size);
                 } else {
                     String apiId =
                             NextcloudTalkApplication.Companion.getSharedApplication().getString(R.string.nc_guest);