style: 统一部分下拉列表样式

src/assets/css/components/views/charts2/networkOverviewApps.scss

@@ -365,12 +365,6 @@
     }
   }
 }
-.el-select__popper.app-metric {
-  top: 27px !important;
-  .el-popper__arrow {
-    display: none;
-  }
-}
 .app-dropdown.el-popper.is-pure {
   .el-scrollbar {
     .el-scrollbar__wrap {

src/assets/css/components/views/charts2/networkOverviewLine.scss

@@ -154,13 +154,6 @@
       }
     }
   }
-
-}
-.metric.el-select__popper,.reference-line.el-select__popper {
-  top: 221px !important;
-  .el-popper__arrow {
-    display: none;
-  }
 }
 .el-select-dropdown {
   .el-scrollbar {

src/assets/css/components/views/charts2/networkOverviewTabs.scss

@@ -270,9 +270,3 @@
   right:200px !important;
   transform: translateY(126px) !important;*/
 }
-.metric-select.el-select__popper {
-  top: 27px !important;
-  .el-popper__arrow {
-    display: none;
-  }
-}

src/assets/css/components/views/charts2/npmMap.scss

@@ -14,7 +14,12 @@
     position: absolute;
     right: 10px;
     top: 10px;
-
+    .el-select__popper.map-select-down {
+      top: 32px !important;
+      .el-popper__arrow {
+        display: none;
+      }
+    }
     .map-select {
       margin-left: 10px;