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/alert/config.vue

@@ -16,17 +16,14 @@
     </div>
     <div class="content-right">
       <div class="top-tools">
-        <div>
-
-        </div>
-        <div>
-          <button id="alert-add" @click="toAdd"  :title="$t('overall.createAlertRule')"
-                  class="nz-btn nz-btn-size-normal nz-btn-style-light float-right margin-l-20">
-                      <i class="nz-icon-create-square nz-icon"></i>
-          </button>
+        <div class="top-tool-main-right">
           <div class="top-tool-search float-right">
             <search-input :searchMsg="searchMsg" @search="search"></search-input>
           </div>
+          <button id="alert-add" @click="toAdd"  :title="$t('overall.createAlertRule')"
+                  class="nz-btn nz-btn-size-normal nz-btn-style-light margin-l-20">
+                      <i class="nz-icon-create-square nz-icon"></i>
+          </button>
         </div>
       </div>
       <el-table
@@ -357,9 +354,6 @@
         this.pageObj.pageSize = val;
         localStorage.setItem('nz-pageSize-' + localStorage.getItem('nz-username') + '-' + this.tableId, val);
         this.getTableData();
-        this.$nextTick(() => {
-          this.gutterHandler(".nz-table");
-        });
       },
       search: function (searchObj) {
         this.searchLabel = {};
@@ -420,7 +414,6 @@
 
       this.getTableData();
       this.$nextTick(() => {
-        this.gutterHandler(".nz-table");
         //绑定滚动条事件，控制top按钮
         let el = this.$refs.alertRuleTable.$el.querySelector(".el-table__body-wrapper");
         if (el._ps_) {