Disable subscription payment form when sender is same as recipient

src/components/SubscriptionEthereum.vue

@@ -234,7 +234,10 @@ async function checkSubscription() {
 }
 
 function canSubscribe(): boolean {
-  return subscriptionsEnabled === true
+  return (
+    sender.id !== recipient.id &&
+    subscriptionsEnabled === true
+  )
 }
 
 function getPaymentAmount(): FixedNumber {

src/components/SubscriptionMonero.vue

@@ -168,7 +168,12 @@ function isSubscribed(): boolean {
 }
 
 function canSubscribe(): boolean {
-  return sender.id !== "" && subscriptionPrice !== null && invoice === null
+  return (
+    sender.id !== "" &&
+    sender.id !== recipient.id &&
+    subscriptionPrice !== null &&
+    invoice === null
+  )
 }
 
 function getPaymentAmount(): number {