Bug 1037740 - Update empty private tabs panel styles for small tablet. r=wesj

mobile/android/base/resources/values-large-v11/styles.xml

@@ -107,10 +107,12 @@
 
     <style name="TabsPanelSection.PrivateTabs">
         <item name="android:layout_weight">1</item>
+        <item name="android:layout_marginLeft">20dp</item>
+        <item name="android:layout_marginRight">20dp</item>
     </style>
 
     <style name="TabsPanelSection.PrivateTabs.Header">
-        <item name="android:paddingTop">32dp</item>
+        <item name="android:paddingTop">10dp</item>
     </style>
 
     <style name="TabsPanelItem.TextAppearance.Header.PrivateTabs">