perf: 滚动条调整，table右侧优化等

1.滚动条加宽、legend限制滚动条滑块最小长度
2.取消table右侧滚动条预留区域
3.调整其他因为布局改变而错乱的样式

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

@@ -53,15 +53,14 @@
       <!--dc table start-->
       <div class="content-right" v-if="tabShow==1">
         <div class="top-tools">
-          <div></div>
-          <div>
-            <button type="button" @click="toAdd" :title="$t('overall.createDatacenter')"
-                    class="nz-btn nz-btn-size-normal nz-btn-style-light float-right margin-l-20" id="dc-add">
-              <i class="nz-icon-create-square nz-icon"></i>
-            </button>
-            <div class="top-tool-search float-right">
+          <div class="top-tool-main-right">
+            <div class="top-tool-search">
               <search-input ref="searchInput" :searchMsg="searchMsg" @search="search" v-if="tabShow==1"></search-input>
             </div>
+            <button type="button" @click="toAdd" :title="$t('overall.createDatacenter')"
+                    class="nz-btn nz-btn-size-normal nz-btn-style-light margin-l-20" id="dc-add">
+              <i class="nz-icon-create-square nz-icon"></i>
+            </button>
           </div>
         </div>
         <el-table
@@ -496,9 +495,6 @@
         localStorage.setItem('nz-pageSize-' + localStorage.getItem('nz-username') + '-' + this.tableId, val);
         this.pageObj.pageSize = val;
         this.getTableData();
-        this.$nextTick(() => {
-          this.gutterHandler(".nz-table");
-        });
       },
       search: function (searchObj) {
         this.searchLabel = {};
@@ -576,7 +572,6 @@
 
       this.getTableData();
       this.$nextTick(function(){
-        this.gutterHandler(".nz-table");
         this.getUserData();//绑定滚动条事件，控制top按钮
         let el = this.$refs.dcTable.$el.querySelector(".el-table__body-wrapper");
         if (el._ps_) {