Changing SIMPLIFIED_APPEAR_FRACTION flag to true by default

This makes simplified appearFraction calculation in NotificationStackScrollLayout to be default way of calculation.
It's been enabled in teamfood for a few months now so time to enabled it by default

Bug: 259395680
Test: check NSSL behaviour in portrait with regular notifications and with heads-up notification
Change-Id: I5ea5952f4b2d44f2dd40708060de3b10bb39c55b
diff --git a/packages/SystemUI/src/com/android/systemui/flags/Flags.kt b/packages/SystemUI/src/com/android/systemui/flags/Flags.kt
index ffacf01..069f09b 100644
--- a/packages/SystemUI/src/com/android/systemui/flags/Flags.kt
+++ b/packages/SystemUI/src/com/android/systemui/flags/Flags.kt
@@ -90,7 +90,7 @@
 
     @JvmField
     val SIMPLIFIED_APPEAR_FRACTION =
-        unreleasedFlag(259395680, "simplified_appear_fraction", teamfood = true)
+        releasedFlag(259395680, "simplified_appear_fraction")
 
     // TODO(b/257315550): Tracking Bug
     val NO_HUN_FOR_OLD_WHEN = releasedFlag(118, "no_hun_for_old_when")