Remove feature flag slice injection

Fixes: 121154979
Test: Manual
Change-Id: Ief9c662e28fa5a14879f93138ff2997234e72008
diff --git a/core/java/android/util/FeatureFlagUtils.java b/core/java/android/util/FeatureFlagUtils.java
index f2aaead..e8b0d92 100644
--- a/core/java/android/util/FeatureFlagUtils.java
+++ b/core/java/android/util/FeatureFlagUtils.java
@@ -53,7 +53,6 @@
         DEFAULT_FLAGS.put("settings_audio_switcher", "true");
         DEFAULT_FLAGS.put("settings_mobile_network_v2", "true");
         DEFAULT_FLAGS.put("settings_network_and_internet_v2", "true");
-        DEFAULT_FLAGS.put("settings_slice_injection", "true");
         DEFAULT_FLAGS.put("settings_systemui_theme", "true");
         DEFAULT_FLAGS.put(DYNAMIC_SYSTEM, "false");
         DEFAULT_FLAGS.put(SEAMLESS_TRANSFER, "false");