fix: use latest webln if available in globalThis after init

src/lightning-address.ts

@@ -54,6 +54,10 @@ export default class LightningAddress {
     }
   }
 
+  getWebLN() {
+    return this.webln || globalThis.webln
+  }
+
   async fetch() {
     if (this.options.proxy) {
       return this.fetchWithProxy();
@@ -186,7 +190,7 @@ export default class LightningAddress {
         boost,
       },
       {
-        webln: this.webln,
+        webln: this.getWebLN(),
       },
     );
   }
@@ -233,12 +237,13 @@ export default class LightningAddress {
     options: ZapOptions = {},
   ): Promise<SendPaymentResponse> {
     const invoice = this.zapInvoice(args, options);
-    if (!this.webln) {
+    const webln = this.getWebLN()
+    if (!webln) {
       // mainly for TS
       throw new Error("WebLN not available");
     }
-    await this.webln.enable();
-    const response = this.webln.sendPayment((await invoice).paymentRequest);
+    await webln.enable();
+    const response = webln.sendPayment((await invoice).paymentRequest);
     return response;
   }