Fix master clock becoming incorrectly paused when all spectator players are too far ahead

osu.Game/Screens/OnlinePlay/Multiplayer/Spectate/CatchUpSyncManager.cs

@@ -130,6 +130,9 @@ private void updatePlayerCatchup()
                 // This is a quiet case in which the catchup is done by the master clock, so IsCatchingUp is not set on the player clock.
                 if (timeDelta < -SYNC_TARGET)
                 {
+                    // Importantly, set the clock to a non-catchup state. if this isn't done, updateMasterState may incorrectly pause the master clock
+                    // when it is required to be running (ie. if all players are ahead of the master).
+                    clock.IsCatchingUp = false;
                     clock.Stop();
                     continue;
                 }