chore: 修改logo

src/components/learnSysLayout/navigation.vue

 <template>
   <div class="menu">
     <div class="nav-left">
-      <img class="logo" src="https://zws-imgs-pub.ezijing.com/pc/base/logo.svg" alt="logo" />
+      <img class="logo" src="https://webapp-pub.ezijing.com/project/cbu-plus/logo.png" alt="logo" />
       <div class="text-title" @click="setStatus">{{ $t('components.learnSysLayout.navigation.title') }}</div>
     </div>
     <div class="nav-right">