Reduce the time when getRemainingTimeoutSeconds request is made from 30s to 20s, so fewer calls are made

Author: elit0451

src/Umbraco.Web.UI.Client/src/common/services/user.service.js

@@ -65,17 +65,17 @@ angular.module('umbraco.services')
                     //countdown by 5 seconds since that is how long our timer is for.
                     currentUser.remainingAuthSeconds -= 5;
 
-                    //if there are more than 30 remaining seconds, recurse!
-                    if (currentUser.remainingAuthSeconds > 30) {
+                    //if there are more than 20 remaining seconds, recurse!
+                    if (currentUser.remainingAuthSeconds > 20) {
 
                         //we need to check when the last time the timeout was set from the server, if
-                        // it has been more than 30 seconds then we'll manually go and retrieve it from the
+                        // it has been more than 20 seconds then we'll manually go and retrieve it from the
                         // server - this helps to keep our local countdown in check with the true timeout.
                         if (lastServerTimeoutSet != null) {
                             var now = new Date();
                             var seconds = (now.getTime() - lastServerTimeoutSet.getTime()) / 1000;
 
-                            if (seconds > 30) {
+                            if (seconds > 20) {
 
                                 //first we'll set the lastServerTimeoutSet to null - this is so we don't get back in to this loop while we
                                 // wait for a response from the server otherwise we'll be making double/triple/etc... calls while we wait.
@@ -116,7 +116,7 @@ angular.module('umbraco.services')
                             countdownUserTimeout();
                         }
                         else {
-                            //we've got less than 30 seconds remaining so let's check the server
+                            //we've got less than 20 seconds remaining so let's check the server
 
                             if (lastServerTimeoutSet != null) {
                                 //first we'll set the lastServerTimeoutSet to null - this is so we don't get back in to this loop while we