Changed editor back button behavior.

Bug: 8522150
Change-Id: I803054138df931c4c48ef03930afe79e272f0d4b
diff --git a/src/com/android/gallery3d/filtershow/FilterShowActivity.java b/src/com/android/gallery3d/filtershow/FilterShowActivity.java
index 3cd4262..dbf26e4 100644
--- a/src/com/android/gallery3d/filtershow/FilterShowActivity.java
+++ b/src/com/android/gallery3d/filtershow/FilterShowActivity.java
@@ -1005,17 +1005,12 @@
                         saveImage();
                     }
                 });
-                builder.setNeutralButton(R.string.exit, new DialogInterface.OnClickListener() {
+                builder.setNegativeButton(R.string.exit, new DialogInterface.OnClickListener() {
                     public void onClick(DialogInterface dialog, int id) {
                         done();
                     }
                 });
-                builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
-                    public void onClick(DialogInterface dialog, int id) {
-                    }
-                });
-
-                AlertDialog dialog = builder.show();
+                builder.show();
             }
         }
     }