Correct bug field in dimmer_refactor flag definition

Bug: 295291019
Test: NA
Change-Id: I1386c343d48f8a3c0a8dfac71b7db1599c49cba0

core/java/android/window/flags/windowing_frontend.aconfig

@@ -18,7 +18,7 @@ flag {
   name: "dimmer_refactor"
   namespace: "windowing_frontend"
   description: "Refactor dim to fix flickers"
-  bug: "281632483,295291019"
+  bug: "295291019"
   is_fixed_read_only: true
 }