Move magnification_enlarge_pointer aconfig to bugfix flag

This is now rolled out as a bugfix.

Bug: 355734856
Test: atest com.android.server.accessibility.magnification (with/without flag enabled)
Flag: com.android.server.accessibility.magnification_enlarge_pointer_bugfix

Change-Id: Ia08e3192577e991acda9a1293fe40a39b2f32f70
diff --git a/services/accessibility/accessibility.aconfig b/services/accessibility/accessibility.aconfig
index cb4e994..2808056 100644
--- a/services/accessibility/accessibility.aconfig
+++ b/services/accessibility/accessibility.aconfig
@@ -175,10 +175,13 @@
 }
 
 flag {
-    name: "magnification_enlarge_pointer"
+    name: "magnification_enlarge_pointer_bugfix"
     namespace: "accessibility"
     description: "When fullscreen magnification is enabled, pointer icon is enlarged"
     bug: "355734856"
+    metadata {
+        purpose: PURPOSE_BUGFIX
+    }
 }
 
 flag {