style(knowledge): 修改知识库列表页面修改按钮样式

- 将修改按钮的样式从默认样式改为 line-button 样式
-此修改旨在提升页面视觉效果和用户体验

src/views/knowledge/index.vue

@@ -43,7 +43,7 @@
             </div>
             <div class="opacity-button">
               <el-button class="default render-button" icon="el-icon-delete" @click.stop="deleteKnowLedge(item)">删除</el-button>
-              <el-button class="render-button" icon="el-icon-edit" @click.stop="createdKnowLedge(item)" type="primary">修改</el-button>
+              <el-button class="render-button line-button" icon="el-icon-edit" @click.stop="createdKnowLedge(item)" type="primary">修改</el-button>
             </div>
           </div>