Replace ENABLE_LAUNCHER_BR_METRICS flags with fixed aconfig flag.

This is necessary because the value of the read-write flag will not be updated in time for backup/restore.

Bug: 307527314
Test: compiles
Flag: ACONFIG ENABLE_LAUNCHER_BR_METRICS_FIXED TEAMFOOD
Change-Id: I67a1a820734d8881b3ed5be4a1f2f1556e6e4704
diff --git a/aconfig/launcher.aconfig b/aconfig/launcher.aconfig
index f5afd88..3166d82 100644
--- a/aconfig/launcher.aconfig
+++ b/aconfig/launcher.aconfig
@@ -71,13 +71,6 @@
 }
 
 flag {
-    name: "enable_launcher_br_metrics"
-    namespace: "launcher"
-    description: "Enables logging of Launcher restore metrics to the Backup & Restore team"
-    bug: "307527314"
-}
-
-flag {
     name: "enable_unfolded_two_pane_picker"
     namespace: "launcher"
     description: "Enables two pane widget picker for unfolded foldables"
@@ -104,3 +97,11 @@
     description: "Enables long-press shortcut to install a copy of an app to Private space"
     bug: "316118005"
 }
+
+flag {
+    name: "enable_launcher_br_metrics_fixed"
+    namespace: "launcher"
+    description: "Enables logging of Launcher restore metrics to the Backup & Restore team"
+    bug: "307527314"
+    is_fixed_read_only: true
+}