Remove all reference to settings_side_margin.

- since the overlay of the value for bigger screen has been removed,
the side margin is now always 0dp. Remove this dimen value and all
reference to it.

Fixes: 124526984
Test: rebuild and visual
Change-Id: I68ff42513a379111042cab9b34594822544e246e

res/values/dimens.xml

@@ -59,7 +59,6 @@
     <dimen name="color_mode_preview_height">320dp</dimen>
 
     <dimen name="ring_progress_bar_thickness">4dp</dimen>
-    <dimen name="settings_side_margin">0dip</dimen>
 
     <!-- Weight of the left pane in a multi-pane preference layout. -->
     <integer name="preferences_left_pane_weight">4</integer>

res/values/styles.xml

@@ -69,8 +69,6 @@
     </style>
 
     <style name="PreferenceFragmentListSinglePane" parent="@*android:style/PreferenceFragmentList">
-        <item name="android:paddingStart">@dimen/settings_side_margin</item>
-        <item name="android:paddingEnd">@dimen/settings_side_margin</item>
         <item name="android:layout_marginStart">0dp</item>
         <item name="android:layout_marginEnd">0dp</item>
         <item name="android:scrollbarStyle">outsideOverlay</item>

res/values/themes.xml

@@ -38,7 +38,7 @@
         <item name="wifi_signal_color">?android:attr/colorAccent</item>
         <item name="wifi_friction">@drawable/wifi_friction</item>
 
-        <item name="side_margin">@dimen/settings_side_margin</item>
+        <item name="side_margin">0dp</item>
         <item name="sudListItemIconColor">?android:attr/colorAccent</item>
 
         <!-- Redefine the ActionBar style for contentInsetStart -->