stripe: add jpy

app/Http/Requests/Admin/ConfigSave.php

@@ -48,7 +48,7 @@ class ConfigSave extends FormRequest
         'stripe_sk_live' => '',
         'stripe_pk_live' => '',
         'stripe_webhook_key' => '',
-        'stripe_currency' => 'in:hkd,usd,sgd,eur,gbp',
+        'stripe_currency' => 'in:hkd,usd,sgd,eur,gbp,jpy',
         // bitpayx
         'bitpayx_name' => '',
         'bitpayx_enable' => 'in:0,1',