[FIX] gamification, web: Edge does not support obj spread operator

As of August 20 2019, Microsoft Edge partially supports ECMA2018.
For instance, `Promise.prototype.finally()` can be used, but the
spread operator does not work on objects.

Task-ID 2056070

addons/gamification/static/src/js/crash_manager.js

@@ -11,10 +11,9 @@ CrashManager.include({
      * @override
      */
     getMapTitle() {
-        return {
-            ...this._super(...arguments),
+        return Object.assign({}, this._super(...arguments), {
             karma_error: _lt("Karma Error"),
-        };
+        });
     },
 });
 });

addons/web/static/src/js/public/public_crash_manager.js

@@ -14,12 +14,11 @@ const PublicCrashManager = CrashManager.extend({
      * @override
      */
     _displayWarning(message, title, options) {
-        this.displayNotification({
-            ...options,
+        this.displayNotification(Object.assign({}, options, {
             title,
             message,
             sticky: true,
-        });
+        }));
     },
 });
 

addons/web/static/src/js/services/crash_manager.js

@@ -317,10 +317,9 @@ var CrashManager = AbstractService.extend({
      * @param {Object} options
      */
     _displayWarning: function (message, title, options) {
-        return new WarningDialog(this, {
-            ...options,
+        return new WarningDialog(this, Object.assign({}, options, {
             title,
-        }, {
+        }), {
             message,
         }).open();
     },