Use device default accent color in live picker

Also don't use a preview window as the activity is translucent.

Bug: 28625050
Change-Id: Ia1f28a6d321a7bc9791f8308d2c84f5514725637
diff --git a/res/values/styles.xml b/res/values/styles.xml
index 361d824..ff942e2 100644
--- a/res/values/styles.xml
+++ b/res/values/styles.xml
@@ -32,6 +32,11 @@
         <!-- Set status bar and navigation buttons to be translucent. -->
         <item name="android:colorPrimaryDark">@color/translucent_black</item>
         <item name="android:navigationBarColor">@color/translucent_black</item>
+
+        <item name="colorAccent">@*android:color/accent_device_default_dark</item>
+
+        <item name="android:windowDisablePreview">true</item>
+
     </style>
 
     <style name="TranslucentToolbarStyle" parent="@style/Widget.AppCompat.Toolbar">