Scale the work profile background properly

Fixes: 135742033

Test: Set up work profile, use BiometricPromptDemo on both profiles
      Background is not cut off on top / bottom anymore

Change-Id: I40476782c6b38a3562136d6ad0d2f465074dcfc1

packages/SystemUI/src/com/android/systemui/biometrics/BiometricDialogView.java

@@ -267,6 +267,7 @@ public abstract class BiometricDialogView extends LinearLayout {
                     mContext.getTheme());
             image.setColorFilter(mDevicePolicyManager.getOrganizationColorForUser(mUserId),
                     PorterDuff.Mode.DARKEN);
+            backgroundView.setScaleType(ImageView.ScaleType.CENTER_CROP);
             backgroundView.setImageDrawable(image);
         } else {
             backgroundView.setImageDrawable(null);