Modify icon color and fix search bar corner

- add android:colorAccent attribute in theme
- fix wrong xmlns

Change-Id: Ia8a0a715edf40959c952f8982298a830bedfa156
Fixes: 111359684
Test: manual

res/layout/search_bar.xml

@@ -17,7 +17,7 @@
 
 <FrameLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/tools"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:id="@+id/search_bar_container"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"

res/values/themes.xml

@@ -379,6 +379,7 @@
         <!-- copied from frameworks/base/core/res/res/values/themes_device_defaults.xml -->
         <item name="colorPrimary">@*android:color/primary_device_default_settings_light</item>
         <item name="colorPrimaryDark">@*android:color/primary_dark_device_default_settings_light</item>
+        <item name="android:colorAccent">@*android:color/accent_device_default_light</item>
     </style>
 
 </resources>