fix: await sender registration in multiple pxe script

Author: critesjosh

scripts/multiple_pxe.ts

@@ -74,7 +74,7 @@ async function main() {
 
     // setup account on 2nd pxe
 
-    pxe2.registerSender(ownerAddress)
+    await pxe2.registerSender(ownerAddress)
 
     let secretKey2 = Fr.random();
     let salt2 = Fr.random();
@@ -83,7 +83,7 @@ async function main() {
     // deploy account on 2nd pxe
     let tx2 = await schnorrAccount2.deploy({ fee: { paymentMethod } }).wait();
     let wallet2 = await schnorrAccount2.getWallet();
-    wallet2.registerSender(ownerAddress)
+    await wallet2.registerSender(ownerAddress)
 
     // mint to account on 2nd pxe