SettingsIntelligence: fix search panel bg color for correct themeing

Change-Id: Iaddcf884f75ec930ba7229cdeb2e244c7a23b3af
diff --git a/res/layout/search_panel.xml b/res/layout/search_panel.xml
index b5933cc..01f098c 100644
--- a/res/layout/search_panel.xml
+++ b/res/layout/search_panel.xml
@@ -25,7 +25,7 @@
         android:id="@+id/search_bar_container"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:background="@color/search_panel_background"
+        android:background="?android:attr/colorPrimary"
         android:elevation="4dp">
         <android.support.v7.widget.CardView
             android:id="@+id/search_bar"
@@ -105,4 +105,4 @@
 
     <include layout="@layout/search_feedback"/>
 
-</LinearLayout>
\ No newline at end of file
+</LinearLayout>