Update Theme.DialogWhenLarge to use theme colors.

This theme is at least used by the Phone Status activity and probably
others as well.

BUG: 28760785

Change-Id: If3faa84ad9d291f007c7191f1c0dba8d98fe9bf8
diff --git a/res/values/themes.xml b/res/values/themes.xml
index 511e462..216b090 100644
--- a/res/values/themes.xml
+++ b/res/values/themes.xml
@@ -213,6 +213,9 @@
     </style>
 
     <style name="Theme.DialogWhenLarge" parent="@*android:style/Theme.Material.Settings.DialogWhenLarge">
+        <item name="android:colorPrimary">@color/primary_color</item>
+        <item name="android:colorAccent">@color/accent_color</item>
+        <item name="colorSecondary">@color/secondary_color</item>
         <!-- Redefine the ActionBar style for contentInsetStart -->
         <item name="android:actionBarStyle">@style/Theme.ActionBar</item>