Display the name of the creator for flags & skins (#3510)

## Description:

So artists get credit for the work they do.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

evan

src/client/Store.ts

@@ -188,6 +188,7 @@ export class StoreModal extends BaseModal {
             name: flag.name,
             url: flag.url,
             product: flag.product,
+            artist: flag.artist,
           }}
           .selected=${selectedFlag === `flag:${key}`}
           .requiresPurchase=${rel === "purchasable"}