fix: export qrcode was undefined (#3689)

lnbits/static/js/components/lnbits-wallet-extra.js

@@ -1,9 +1,10 @@
 window.app.component('lnbits-wallet-extra', {
   template: '#lnbits-wallet-extra',
-  mixins: [window.windowMixin],
   props: ['chartConfig'],
-  data() {
-    return {}
+  computed: {
+    exportUrl() {
+      return `${window.location.origin}/wallet?usr=${this.g.user.id}&wal=${this.g.wallet.id}`
+    }
   },
   methods: {
     handleSendLnurl(lnurl) {

lnbits/templates/components/lnbits-wallet-extra.vue

@@ -83,9 +83,7 @@
                       class="text-center"
                       v-text="$t('export_to_phone_desc')"
                     ></p>
-                    <lnbits-qrcode
-                      :value="`${baseUrl}wallet?usr=${g.user.id}&wal=${g.wallet.id}`"
-                    ></lnbits-qrcode>
+                    <lnbits-qrcode :value="exportUrl"></lnbits-qrcode>
                   </q-card-section>
                 </q-card>
               </q-expansion-item>