fix scripted pre-roll overlap (#2394)

* fix scripted pre-roll overlap

* cleanup

ErsatzTV.Core/Scheduling/Engine/SchedulingEngine.cs

@@ -715,6 +715,9 @@ public class SchedulingEngine(
                 remainingToFill = targetTime - _state.CurrentTime;
                 if (remainingToFill <= TimeSpan.Zero)
                 {
+                    // TODO: this shouldn't be needed, but prevents overlap
+                    _state.AddedItems.RemoveAll(pi => pi.FinishOffset >= targetTime);
+                    _state.CurrentTime = _state.AddedItems.Max(pi => pi.FinishOffset);
                     break;
                 }
             }