修复退出全屏图标错误

modules/ext.isekai.function-btn.js

@@ -16,7 +16,7 @@ function onFullScreenChange() {
 $(function () {
     if (mw.config.get('wgIsArticle')) {
         var fullScreenIcon = new OO.ui.IconWidget({ icon: 'fullScreen' });
-        var exitFullScreenIcon = new OO.ui.IconWidget({ icon: 'exitFullScreen' });
+        var exitFullScreenIcon = new OO.ui.IconWidget({ icon: 'exitFullscreen' });
 
         fullScreenBtn = isekai.bottomNav.addButton({
             id: 'fullscreen',