fixed missing 200 issue

Change-Id: Ia9abdedafa036b1d643d87b2ef2f4df2b04ac32a

jams-server/src/main/java/net/jami/jams/server/servlets/api/install/InstallLastStepServlet.java

@@ -40,6 +40,7 @@ public class InstallLastStepServlet extends HttpServlet {
         resp.setHeader("Access-Control-Allow-Origin", JamsCA.serverDomain);
         HashMap<String,String> payload = new HashMap<>();
         payload.put("uri",CachedObjects.endpoint);
+        resp.setStatus(200);
         resp.getOutputStream().write(JsonStream.serialize(payload).getBytes());
     }
 }