Fixes for dbviewer table export

1)Passing filename filled in form
2)Using sort on export

Author: Cookiezaurs

plugins/dbviewer/frontend/public/javascripts/countly.views.js

@@ -178,13 +178,18 @@
                 this.tableStore.dispatch("fetchDbviewerTable", {_silent: !force});
             },
             getExportQuery: function() {
+
+                var sort = "";
+                if (this.sortEnabled) {
+                    sort = JSON.stringify(this.preparedSortObject);
+                }
                 var apiQueryData = {
                     api_key: countlyGlobal.member.api_key,
                     app_id: countlyCommon.ACTIVE_APP_ID,
-                    filename: "DBViewer" + moment().format("DD-MMM-YYYY"),
+                    //filename: "DBViewer" + moment().format("DD-MMM-YYYY"), - using passed filename from form
                     projection: JSON.stringify(this.preparedProjectionFields),
                     query: this.queryFilter,
-                    //sort: JSON.stringify(this.preparedSortObject),
+                    sort: sort,
                     collection: this.collection,
                     db: this.db,
                     url: "/o/export/db"
@@ -251,7 +256,9 @@
             },
             preparedSortObject: function() {
                 var ob = {};
-                ob[this.sort] = this.isDescentSort ? -1 : 1;
+                if (this.sort) {
+                    ob[this.sort] = this.isDescentSort ? -1 : 1;
+                }
                 return ob;
             }
         },