Remove broken frame

osu.Game.Rulesets.Osu.Tests/TestCaseSliderInput.cs

@@ -297,11 +297,6 @@ public void TestTrackingReleasedValidKey()
 
         private void performTest(List<ReplayFrame> frames)
         {
-            // Empty frame to be added as a workaround for first frame behavior.
-            // If an input exists on the first frame, the input would apply to the entire intro lead-in
-            // Likely requires some discussion regarding how first frame inputs should be handled.
-            frames.Insert(0, new OsuReplayFrame());
-
             AddStep("load player", () =>
             {
                 Beatmap.Value = new TestWorkingBeatmap(new Beatmap<OsuHitObject>