Fix Widget Header w/ RTL Text

Also modified icon to take up all the header space
so that dragging on it causes the background to highlight
a 56 x 56 square space instead of looking really awkward.

Bug: 17206631
Change-Id: I68e5d746935cf411aa9f06ba99057cc21886ac04
diff --git a/res/values/styles.xml b/res/values/styles.xml
index 7af293b..dc4aef7 100644
--- a/res/values/styles.xml
+++ b/res/values/styles.xml
@@ -821,6 +821,10 @@
         <item name="android:paddingRight">@dimen/widget_attachment_padding_end</item>
     </style>
 
+    <style name="WidgetHeaderStartMargin">
+        <item name="android:paddingLeft">16dp</item>
+    </style>
+
     <style name="SearchTextStyle">
         <item name="android:textColor">@color/search_banner_text</item>
         <item name="android:textSize">@dimen/search_banner_text_size</item>