Fix extra space.

Author: ludoch

appengine-java21/bigtable/src/main/webapp/WEB-INF/appengine-web.xml

@@ -21,5 +21,5 @@
     <property name="BIGTABLE_PROJECT" value="@bigtable.projectID@" />
     <property name="BIGTABLE_INSTANCE" value="@bigtable.instanceID@" />
     <property name="java.util.logging.config.file" value="WEB-INF/logging.properties"/>
-    </system-properties>
+  </system-properties>
 </appengine-web-app>