Update enable_grid_only_overview to use correct release bug

Bug: 270397206
Test: presubmit
Change-Id: I513d77c61ee87485ecf0061d3b3a3c3a74c45982
diff --git a/aconfig/launcher.aconfig b/aconfig/launcher.aconfig
index 226d717..8fddc0f 100644
--- a/aconfig/launcher.aconfig
+++ b/aconfig/launcher.aconfig
@@ -18,5 +18,5 @@
     name: "enable_grid_only_overview"
     namespace: "launcher"
     description: "Enable a grid-only overview without a focused task."
-    bug: "270397206"
+    bug: "257950105"
 }