perf[Login Form]: optimize eye icon style

src/views/login/index.vue

@@ -20,7 +20,7 @@
           placeholder="password"
           @keyup.enter.native="handleLogin" />
         <span class="show-pwd" @click="showPwd">
-          <svg-icon icon-class="eye" />
+          <svg-icon :icon-class="pwdType === 'password' ? 'eye' : 'eye-open'" />
         </span>
       </el-form-item>
       <el-form-item>