re-use existing progress and message properties

now, when we go back to the app grid, it reflects immediately

src/js/client.js

@@ -1793,6 +1793,11 @@ angular.module('Application').service('Client', ['$http', '$interval', '$timeout
                 if (task) {
                     app.progress = task.percent;
                     app.message = task.message;
+                    app.taskMinutesActive = moment.duration(moment.utc().diff(moment.utc(task.creationTime))).asMinutes();
+                } else {
+                    app.progress = 0;
+                    app.message = '';
+                    app.taskMinutesActive = 0;
                 }
 
                 that._updateAppCache(app);