Fix alignment of ActionBar title and Preferences for tablet UI

- use the correct start/end padding

See bug: #15439371 Visual add white BG for Settings Detail

Change-Id: I391fb3c75c51349ffbc17295b3aac6f432f91b58
diff --git a/res/layout/preference_list_fragment.xml b/res/layout/preference_list_fragment.xml
index 297e33b..a97415e 100644
--- a/res/layout/preference_list_fragment.xml
+++ b/res/layout/preference_list_fragment.xml
@@ -29,8 +29,8 @@
               android:layout_width="match_parent"
               android:layout_height="0px"
               android:layout_weight="1"
-              android:paddingStart="@dimen/dashboard_padding_start"
-              android:paddingEnd="@dimen/dashboard_padding_end"
+              android:paddingStart="@dimen/settings_side_margin"
+              android:paddingEnd="@dimen/settings_side_margin"
               android:paddingTop="@dimen/dashboard_padding_top"
               android:paddingBottom="@dimen/dashboard_padding_bottom"
               android:scrollbarStyle="@*android:integer/preference_fragment_scrollbarStyle"