Update 500.html

public/static/theme/err/500.html

@@ -14,6 +14,6 @@
     <div class="error-num__clip">500</div>
 </div>
 <p id="desc">咦，系统似乎出问题了。</p>
-<p><a style="color:#00F7DE;font-size:28px" href="{:url('@index')}" target="_blank">回到首页</a></p>
+<p><a style="color:#00F7DE;font-size:28px" href="{:url('@index')}">回到首页</a></p>
 </body>
 </html>