Delete enable_split_from_fullscreen_with_keyboard_shortcuts from aconfig

It's merged with split_contextual in ag/25511408

Bug: 270394122
Test: N/A
Change-Id: Idabddee7c566ec426be744261ff50d7b360e2afa
diff --git a/aconfig/launcher.aconfig b/aconfig/launcher.aconfig
index 228c34a..1fac4e3 100644
--- a/aconfig/launcher.aconfig
+++ b/aconfig/launcher.aconfig
@@ -71,13 +71,6 @@
 }
 
 flag {
-    name: "enable_split_from_fullscreen_with_keyboard_shortcuts"
-    namespace: "launcher"
-    description: "Enables initiating split from a fullscreen app using keyboard shortcuts"
-    bug: "270394122"
-}
-
-flag {
     name: "enable_launcher_br_metrics"
     namespace: "launcher"
     description: "Enables logging of Launcher restore metrics to the Backup & Restore team"