fix: 修复邮件通知类型中username未赋值导致的setFrom逻辑错误

Author: squlenhat

jetlinks-components/notify-component/notify-email/src/main/java/org/jetlinks/community/notify/email/embedded/DefaultEmailNotifier.java

@@ -125,6 +125,7 @@ public DefaultEmailNotifier(String id,
         mailSender.setJavaMailProperties(properties.createJavaMailProperties());
         this.notifierId = id;
         this.sender = properties.getSender();
+        this.username = properties.getUsername();
         this.javaMailSender = mailSender;
         this.fileManager = fileManager;
         this.webClient = builder.build();