Remove summary template in sleep timeout setting.

The template causes incorrect display in search, and it's not
needded by anyone in code.

Bug: 36101902
Test: rerun robotests
Change-Id: Ib399e15c799e08d377b124e88eda0b8f13494ed3
diff --git a/res/xml/display_settings.xml b/res/xml/display_settings.xml
index 9d4acb4..b9ff780 100644
--- a/res/xml/display_settings.xml
+++ b/res/xml/display_settings.xml
@@ -53,7 +53,7 @@
     <com.android.settings.TimeoutListPreference
         android:key="screen_timeout"
         android:title="@string/screen_timeout"
-        android:summary="@string/screen_timeout_summary"
+        android:summary="@string/summary_placeholder"
         android:entries="@array/screen_timeout_entries"
         android:entryValues="@array/screen_timeout_values" />
 
diff --git a/tests/robotests/src/com/android/settings/search/XmlParserUtilTest.java b/tests/robotests/src/com/android/settings/search/XmlParserUtilTest.java
index 5b7efcd..e35eb10 100644
--- a/tests/robotests/src/com/android/settings/search/XmlParserUtilTest.java
+++ b/tests/robotests/src/com/android/settings/search/XmlParserUtilTest.java
@@ -89,7 +89,7 @@
                 "com.android.settings.TimeoutListPreference");
         final AttributeSet attrs = Xml.asAttributeSet(parser);
         String summary = XmlParserUtils.getDataSummary(mContext, attrs);
-        String expSummary = mContext.getString(R.string.screen_timeout_summary);
+        String expSummary = mContext.getString(R.string.summary_placeholder);
         assertThat(summary).isEqualTo(expSummary);
 
     }