fix(doctorstation): 统一儿童患者家长姓名输入框提示文本

- 将诊断组件中家长姓名输入框占位符从"≤14 岁必填"改为"≤14岁必填"
- 将传染病报告组件中家长姓名输入框占位符统一为"≤14岁必填"
- 移除多余的条件判断逻辑，简化占位符显示逻辑

openhis-ui-vue3/src/views/doctorstation/components/infectiousReport/index.vue

@@ -31,7 +31,7 @@
           </el-col>
           <el-col :span="8">
             <el-form-item :label="'家长姓名' + (isChildPatient ? '' : '')" :prop="isChildPatient ? 'parentName' : ''" :required="isChildPatient">
-              <el-input v-model="form.parentName" :placeholder="isChildPatient ? '14岁以下必填' : '选填'" />
+              <el-input v-model="form.parentName" placeholder="≤14岁必填" />
             </el-form-item>
           </el-col>
           <el-col :span="8">