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/diagnosis/infectiousDiseaseReportDialog.vue

@@ -32,7 +32,7 @@
           </el-col>
           <el-col :span="8" class="form-item">
             <span :class="['form-label', isChildPatient ? 'required' : '']">家长姓名</span>
-            <el-input v-model="form.parentName" class="underline-input" placeholder="≤14 岁必填" />
+            <el-input v-model="form.parentName" class="underline-input" placeholder="≤14岁必填" />
           </el-col>
           <el-col :span="8" class="form-item">
             <span class="form-label required">身份证号</span>