style(脑图): 功能用例脑图缺陷按钮样式

--bug=1047044 --user=白奇 【测试用例】脑图模式-缺陷-直接关联-测试计划和关联缺陷按钮粘到一起了 https://www.tapd.cn/55049933/s/1584657

frontend/src/assets/style/arco-reset.less

@@ -522,7 +522,7 @@
 .arco-radio-group-size-medium {
   .arco-radio-button {
     margin: 0;
-    line-height: 28px;
+    line-height: 24px;
   }
 }
 .arco-radio {

frontend/src/components/business/ms-minders/featureCaseMinder/bugList.vue

@@ -1,13 +1,7 @@
 <template>
   <a-spin :loading="bugListLoading" class="block h-full pl-[16px]">
-    <div class="flex items-center justify-between">
-      <a-radio-group
-        v-model:model-value="showType"
-        type="button"
-        size="medium"
-        class="file-show-type ml-[4px]"
-        @change="handleShowTypeChange"
-      >
+    <div class="flex items-center justify-between gap-[24px]">
+      <a-radio-group v-model:model-value="showType" type="button" class="ml-[4px]" @change="handleShowTypeChange">
         <a-radio value="link" class="show-type-icon p-[2px]">
           {{ t('caseManagement.featureCase.directLink') }}
         </a-radio>