fix: Fix API endpoint for Frankfurter

(cherry picked from commit 33e72111c7)

erpnext/setup/install.py

@@ -80,7 +80,7 @@ def setup_currency_exchange():
 		ces.set("result_key", [])
 		ces.set("req_params", [])
 
-		ces.api_endpoint = "https://frankfurter.app/{transaction_date}"
+		ces.api_endpoint = "https://api.frankfurter.app/{transaction_date}"
 		ces.append("result_key", {"key": "rates"})
 		ces.append("result_key", {"key": "{to_currency}"})
 		ces.append("req_params", {"key": "base", "value": "{from_currency}"})