[Toast] Remove feature flag for rich answer, use all apps flag instead.

This is to prepare for the server launch.

Bug: 241295640, 256693300
Test: local
Change-Id: Idf1fe2b05e998dbab790d3dc1a7ea63f9daa2df7
diff --git a/src/com/android/launcher3/config/FeatureFlags.java b/src/com/android/launcher3/config/FeatureFlags.java
index b082a67..72209c6 100644
--- a/src/com/android/launcher3/config/FeatureFlags.java
+++ b/src/com/android/launcher3/config/FeatureFlags.java
@@ -301,10 +301,6 @@
             "USE_SEARCH_REQUEST_TIMEOUT_OVERRIDES", false,
             "Use local overrides for search request timeout");
 
-    public static final BooleanFlag ENABLE_RICH_ANSWER = new DeviceFlag(
-            "ENABLE_RICH_ANSWER", false,
-            "Enable rich answer new UI for web answer search results");
-
     public static final BooleanFlag CONTINUOUS_VIEW_TREE_CAPTURE = getDebugFlag(
             "CONTINUOUS_VIEW_TREE_CAPTURE", false, "Capture View tree every frame");