Small improvement

app/src/main/java/eu/faircode/email/AdapterMessage.java

@@ -1710,11 +1710,6 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                             onShowFullConfirmed(message);
                         }
                     })
-                    .setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
-                        @Override
-                        public void onClick(DialogInterface dialog, int which) {
-                        }
-                    })
                     .show();
         }