Revert "omni: aconfig: Enable the new volume panel"

This reverts commit ef26ece5d3ffaf1978d24ec7d13c8d9753f87429.

It's enabled by default in A15

Change-Id: I1d384972802d96f2a503a3277043f2e483c6ca7c
diff --git a/release/aconfig/ap3a/com.android.systemui/systemui_flags.textproto b/release/aconfig/ap3a/com.android.systemui/systemui_flags.textproto
index 1d02f15..a58e9ba 100644
--- a/release/aconfig/ap3a/com.android.systemui/systemui_flags.textproto
+++ b/release/aconfig/ap3a/com.android.systemui/systemui_flags.textproto
@@ -4,10 +4,3 @@
   state: ENABLED
   permission: READ_ONLY
 }
-
-flag_value {
-  package: "com.android.systemui"
-  name: "new_volume_panel"
-  state: ENABLED
-  permission: READ_ONLY
-}