fix(系统设置): 切换工作空间搜索框字体颜色不易辨识

--bug=1014425 --user=李玉号 【系统设置】切换工作空间搜索框字体颜色不易辨识
https://www.tapd.cn/55049933/s/1191683

frontend/src/business/components/common/head/HeaderWs.vue

@@ -31,7 +31,7 @@
 import {
   fullScreenLoading,
   getCurrentUser,
-  getCurrentWorkspaceId, hasPermissions,
+  getCurrentWorkspaceId,
   saveLocalStorage,
   stopFullScreenLoading
 } from "@/common/js/utils";
@@ -167,7 +167,6 @@ export default {
 
 .search-input >>> .el-input__inner {
   border-radius: 0;
-  color: #d2ced8;
   border-color: #b4aebe;
 }