fix: 修复overview的全屏功能失效的问题

nezha-fronted/src/components/page/config/mib.vue

@@ -283,6 +283,7 @@
         this.getTableData();
       },
       downloadMib(mib) {
+        console.info(mib)
         axios.get('/mib/download?id='+mib.id,{responseType: 'blob'}).then(data=>{
           let fileName = new Date().getTime()+'.txt';
           let disposition=data.headers['content-disposition'];

nezha-fronted/src/components/page/dashboard/overview/overview2.vue

@@ -1073,7 +1073,7 @@
         return document.isFullScreen || document.mozIsFullScreen || document.webkitIsFullScreen;
       },
       fullScreen:function(){
-        let container=document.getElementById('mainDisplay');
+        let container = document.querySelector(".overview-content");
         let fullScreenFunc=container.requestFullscreen||container.mozRequestFullScreen||container.webkitRequestFullscreen||container.msRequestFullscreen;
         fullScreenFunc.call(container);
         this.isFullScreen = true;