Fix malformatted preference xml.

Change-Id: I48273492bebb280f422b97ad0d5cbe23ff667a53
Fix: 37343765
Test: instrumentation test
diff --git a/res/xml/security_settings_misc.xml b/res/xml/security_settings_misc.xml
index 86e3b16..7946dd9 100644
--- a/res/xml/security_settings_misc.xml
+++ b/res/xml/security_settings_misc.xml
@@ -60,7 +60,7 @@
     <Preference
         android:key="encryption_and_credential"
         android:title="@string/encryption_and_credential_settings_title"
-        android:summary="@string/encryption_and_credential_settings_summary"/>
+        android:summary="@string/encryption_and_credential_settings_summary"
         android:fragment="com.android.settings.EncryptionAndCredential"/>
 
     <Preference android:key="manage_trust_agents"