refactor oauth2 token generator

components/ui-request-interceptor/io.entgra.device.mgt.core.ui.request.interceptor/src/main/java/io/entgra/device/mgt/core/ui/request/interceptor/DefaultOauth2TokenHandler.java

@@ -44,8 +44,8 @@ import javax.servlet.http.HttpSession;
 import java.io.IOException;
 
 @MultipartConfig
-@WebServlet("/ws-credentials")
+@WebServlet("/default-oauth2-credentials")
-public class WsTokenHandler extends HttpServlet {
+public class DefaultOauth2TokenHandler extends HttpServlet {
     private static final Log log = LogFactory.getLog(DefaultTokenHandler.class);