Allow to override WOPI WebEngine module

diff --git a/modules/platform/nuxeo-wopi/src/main/java/org/nuxeo/wopi/jaxrs/WOPIModule.java b/modules/platform/nuxeo-wopi/src/main/java/org/nuxeo/wopi/jaxrs/WOPIModule.java
index b65af676f24..144ce78c0a2 100644
--- a/modules/platform/nuxeo-wopi/src/main/java/org/nuxeo/wopi/jaxrs/WOPIModule.java
+++ b/modules/platform/nuxeo-wopi/src/main/java/org/nuxeo/wopi/jaxrs/WOPIModule.java
@@ -34,9 +34,7 @@ public class WOPIModule extends WebEngineModule {
 
     @Override
     public Set<Class<?>> getClasses() {
-        Set<Class<?>> result = new HashSet<>();
-        result.add(WOPIRoot.class);
-        result.add(FilesEndpoint.class);
+        Set<Class<?>> result = super.getClasses();
         return result;
     }