MOBILE-1600 mod_quiz: Fix cloud icon colors

Author: jleyva

www/addons/mod/quiz/services/handlers.js

@@ -60,7 +60,7 @@ angular.module('mm.addons.mod_quiz')
 
                 downloadBtn = {
                     hidden: true,
-                    icon: 'ion-ios-cloud-download',
+                    icon: 'ion-ios-cloud-download-outline',
                     label: 'mm.core.download',
                     action: download
                 };

www/addons/mod/scorm/services/handlers.js

@@ -61,7 +61,7 @@ angular.module('mm.addons.mod_scorm')
                 // Create the buttons without action yet. This is to prevent a glitch in the view.
                 downloadBtn = {
                     hidden: true,
-                    icon: 'ion-ios-cloud-download',
+                    icon: 'ion-ios-cloud-download-outline',
                     label: 'mm.core.download'
                 };