Make snooze view taller

When notification guts are shown, we don't make the backing notification
card invisible, we just clip it to the height of the guts view.

However, in S we introduces pretty severe corner rounding, which means
that part of the clipped NotificationContentView can still be visible
behind the guts view.

So make the view a bit taller to account for the corner rounding

Fixes: 191935939
Test: manually view snooze view for each template type
Change-Id: Id5fa910646f78349199d1f47ae7724b8b15e764a

packages/SystemUI/res/layout/notification_snooze.xml

@@ -21,6 +21,8 @@
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:orientation="vertical"
+    android:paddingTop="2dp"
+    android:paddingBottom="2dp"
     android:background="?androidprv:attr/colorSurface"
     android:theme="@style/Theme.SystemUI">