Change padding around icon in searchable items preferences.

Bug: 2795155
Change-Id: Ie2a56711af0bb6126f58ec40f2e8579c1a214ee7
diff --git a/res/layout/searchable_item_preference.xml b/res/layout/searchable_item_preference.xml
index 89850e8..e9f2a46 100644
--- a/res/layout/searchable_item_preference.xml
+++ b/res/layout/searchable_item_preference.xml
@@ -24,12 +24,15 @@
 
     <ImageView android:id="@+id/icon"
         android:layout_width="48dip"
-        android:layout_height="48dip"/>
+        android:layout_height="48dip"
+        android:layout_marginLeft="6dip"
+        android:layout_marginRight="6dip"
+        android:layout_gravity="center" />
 
     <RelativeLayout
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:layout_marginLeft="15dip"
+        android:layout_marginLeft="2dip"
         android:layout_marginRight="6dip"
         android:layout_marginTop="6dip"
         android:layout_marginBottom="6dip"