fix(frontend): self-check 页面 :style 空对象 {} 改用字符串避免 WXML 编译错误

cfc-frontend/pages/family/self-check.vue

@@ -24,7 +24,7 @@
               :key="q.id"
               class="sc-dim-nav-dot-mini"
               :class="{ done: answers[q.id] }"
-              :style="answers[q.id] ? { background: dim.color } : {}"
+              :style="answers[q.id] ? 'background:' + dim.color : 'background:transparent'"
             ></view>
           </view>
         </view>