Fix Print Settings layout padding

- make padding consistent with the rest of the Settings App

See bug: #15384992 Setting Dashboard - padding updates

Change-Id: I2f095951143e5c953405c3cd9ff8f77b76c791ae
diff --git a/res/layout/printer_dropdown_item.xml b/res/layout/printer_dropdown_item.xml
index ad393b8..eaf7c96 100644
--- a/res/layout/printer_dropdown_item.xml
+++ b/res/layout/printer_dropdown_item.xml
@@ -19,14 +19,14 @@
     android:layout_height="wrap_content"
     android:minHeight="48dip"
     android:gravity="center_vertical"
-    android:paddingStart="@*android:dimen/preference_item_padding_side"
-    android:paddingEnd="?android:attr/scrollbarSize"
+    android:paddingStart="?android:attr/listPreferredItemPaddingStart"
+    android:paddingEnd="?android:attr/listPreferredItemPaddingEnd"
     android:background="?android:attr/selectableItemBackground">
 
     <ImageView
         android:id="@+id/icon"
-        android:layout_width="32dip"
-        android:layout_height="32dip"
+        android:layout_width="48dip"
+        android:layout_height="48dip"
         android:layout_gravity="center_vertical"
         android:layout_marginEnd="8dip"
         android:duplicateParentState="true"
@@ -37,6 +37,8 @@
     <LinearLayout
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
+        android:layout_marginTop="6dip"
+        android:layout_marginBottom="6dip"
         android:orientation="vertical">
 
         <TextView