fix(core): Fix swiss and congolese currency codes (#302)

* fix(core) Fix swiss currency code

* fix(core) Fix congolese franc currency code

https://github.com/vendure-ecommerce/vendure/pull/302

packages/core/src/api/schema/common/currency-code.graphql

@@ -58,9 +58,9 @@ enum CurrencyCode {
     "Canadian dollar"
     CAD
     "Congolese franc"
-    CHE
+    CDF
     "Swiss franc"
-    CHW
+    CHF
     "Chilean peso"
     CLP
     "Renminbi (Chinese) yuan"