Fix FrameTimingMetric using StartupMode.WARM

Change-Id: I1d08af6622f893eb6fef83b2b145cf8d6098b372

Author: mlykotom

benchmarks/src/main/java/com/google/samples/apps/nowinandroid/foryou/ScrollForYouFeedBenchmark.kt

@@ -43,7 +43,7 @@ class ScrollForYouFeedBenchmark {
         metrics = listOf(FrameTimingMetric()),
         compilationMode = compilationMode,
         iterations = 10,
-        startupMode = StartupMode.COLD,
+        startupMode = StartupMode.WARM,
         setupBlock = {
             // Start the app
             pressHome()