PayFlow: correct modal closure (Escape / click outside)

src/PayFlow.svelte

@@ -88,9 +88,14 @@
   }
   const canShare = !!navigator.share;
 
+  const dismiss = () => {
+    lnurl=undefined;
+    isOpen=false
+  }
+
 </script>
 
-<Modal {isOpen} size='lg'>
+<Modal {isOpen} toggle={dismiss} size='lg'>
   <ModalHeader>BOLT11 invoice: {stage}</ModalHeader>
   <ModalBody>
     {#if confirmAmount}
@@ -163,8 +168,7 @@
       {/if}
       <button
 	class="btn btn-outline-primary"
-	type="button" on:click="{()=>{isOpen=false; lnurl = null}}">Cancel</button>
+	type="button" on:click="{dismiss}">Cancel</button>
     </div>
-
   </ModalFooter>
 </Modal>