return to Approve screen after cancelling unlock during request approval

src/views/Unlock.svelte

@@ -55,7 +55,14 @@
 
     function cancel() {
         emit('credentials-event', 'unlock-canceled');
-        navigate('Home');
+        if ($appState.currentRequest !== null) {
+            // dirty hack to prevent spurious error when returning to approve screen
+            delete $appState.currentRequest.response;
+            navigate('Approve');
+        }
+        else {
+            navigate('Home');
+        }
     }
 
     onMount(() => {