add missing Dexie import (which causes failure upon download click)

src/views/AccountViewView.vue

@@ -516,6 +516,7 @@
 <script lang="ts">
 import { AxiosError, AxiosRequestConfig } from "axios";
 import Dexie from "dexie";
+import "dexie-export-import";
 import { ImportProgress } from "dexie-export-import/dist/import";
 import { ref } from "vue";
 import { Component, Vue } from "vue-facing-decorator";