Reduce log spam from spectator client when playing offline (ppy#37316)

Noticed in passing when doing something else.

Author: Bartłomiej Dach

osu.Game/Online/Spectator/SpectatorClient.cs

@@ -232,9 +232,11 @@ public void BeginPlaying(long? scoreToken, GameplayState state, Score score)
 
                     if (!success)
                     {
-                        Logger.Log($"Clearing {nameof(SpectatorClient)} state due to failed {nameof(BeginPlayingInternal)} call.");
                         Schedule(() =>
                         {
+                            if (IsConnected.Value)
+                                Logger.Log($"Clearing {nameof(SpectatorClient)} state due to failed {nameof(BeginPlayingInternal)} call.");
+
                             clearScoreState();
 
                             currentState.BeatmapID = null;
@@ -252,7 +254,8 @@ public void HandleFrame(ReplayFrame frame) => Schedule(() =>
         {
             if (!isPlaying)
             {
-                Logger.Log($"Frames arrived at {nameof(SpectatorClient)} outside of gameplay scope and will be ignored.");
+                if (IsConnected.Value)
+                    Logger.Log($"Frames arrived at {nameof(SpectatorClient)} outside of gameplay scope and will be ignored.");
                 return;
             }