Polish FingerprintDialog

Bug: 73818869

Test: dialog matches spec
Change-Id: Ibba456e656559ffbebf1bcae79480ce91772572f
diff --git a/packages/SystemUI/src/com/android/systemui/fingerprint/FingerprintDialogImpl.java b/packages/SystemUI/src/com/android/systemui/fingerprint/FingerprintDialogImpl.java
index 1d43b1d..4b15fbc 100644
--- a/packages/SystemUI/src/com/android/systemui/fingerprint/FingerprintDialogImpl.java
+++ b/packages/SystemUI/src/com/android/systemui/fingerprint/FingerprintDialogImpl.java
@@ -180,8 +180,8 @@
             }
         }
         mReceiver = null;
-        mWindowManager.removeView(mDialogView);
         mDialogShowing = false;
+        mDialogView.startDismiss();
     }
 
     private void handleButtonNegative() {