fix: update payment methods to use 'logo' instead of 'code'

src/pages/_data/payments.json

@@ -137,7 +137,7 @@
   },
   {
     "name": "eSewa",
-    "code": "esewa"
+    "logo": "esewa"
   },
   {
     "name": "Ethereum",
@@ -149,7 +149,7 @@
   },
   {
     "name": "FonePay",
-    "code": "fonepay"
+    "logo": "fonepay"
   },
   {
     "name": "Giropay",