generateComponentPreload: Add missing flatten

Author: RandomByte

lib/tasks/bundlers/generateComponentPreload.js

@@ -107,6 +107,8 @@ module.exports = function({workspace, dependencies, options}) {
 			}));
 		})
 		.then((processedResources) => {
+			return Array.prototype.concat.apply([], processedResources);
+		}).then((processedResources) => {
 			return Promise.all(processedResources.map((resource) => {
 				return workspace.write(resource[0]);
 			}));