Update bug number for enable_magnification_follows_mouse flag.

The bug should be the "fullscreen magnification" bug, not the "window magnification" bug.

Bug:b/354696546
Test:None, aconfig flag change only
Flag: com.android.server.accessibility.enable_magnification_follows_mouse
Change-Id: I1eb67ea614cd4376f132c361d91f8692d6ef8994
diff --git a/services/accessibility/accessibility.aconfig b/services/accessibility/accessibility.aconfig
index 08cc9c3..ffa4841 100644
--- a/services/accessibility/accessibility.aconfig
+++ b/services/accessibility/accessibility.aconfig
@@ -117,7 +117,7 @@
     name: "enable_magnification_follows_mouse"
     namespace: "accessibility"
     description: "Whether to enable mouse following for fullscreen magnification"
-    bug: "335494097"
+    bug: "354696546"
 }
 
 flag {