fix:修复主题选择器组件的样式问题

data-room-ui/packages/BasicComponents/ThemeSelect/index.vue

@@ -116,6 +116,7 @@ export default {
   /deep/ .popper__arrow{
     //background-color: var(--bs-background-2)!important;
     background-color: transparent!important;
+    border-bottom-color:transparent!important;
     &:after{
       border-bottom-color: var(--bs-background-2)!important;
     }