Update mixin.js file path in header.html

resource/template/theme-default/header.html

@@ -19,7 +19,7 @@
     <script src="/static/semantic-ui-alerts.min.js"></script>
     <script src="https://cdn.jsdelivr.net/npm/vue@2.6.14"></script>
     <script src="https://cdn.jsdelivr.net/npm/echarts@5.5.0/dist/echarts.min.js"></script>
-    <script src="/static/theme-default/js/mixin.js?v20240225"></script>
+    <script src="/static/theme-server-status/js/mixin.js?v20240225"></script>
 </head>
 <body>
 {{end}}