Reset avatar is errored when src changes

Closes #844

app/components/Avatar.tsx

@@ -22,6 +22,10 @@ export function Avatar({
   // TODO: just show text... my profile?
   // TODO: also show this if discordAvatar is stale and 404's
 
+  React.useEffect(() => {
+    setIsErrored(false);
+  }, [discordAvatar]);
+
   return (
     <img
       className={clsx("avatar", className)}