chore(lint): fix useOptionalChain rule and remove from config

Author: maxmorozoff

biome.jsonc

@@ -30,8 +30,7 @@
       },
       "complexity": {
         "noForEach": "off",
-        "noBannedTypes": "warn",
-        "useOptionalChain": "warn"
+        "noBannedTypes": "warn"
       },
       "performance": {
         "noDelete": "warn",

packages/open-next/src/core/routing/matcher.ts

@@ -380,7 +380,7 @@ export function handleFallbackFalse(
     });
   const locales = NextConfig.i18n?.locales;
   const routesAlreadyHaveLocale =
-    (locales !== undefined && locales.includes(rawPath.split("/")[1])) ||
+    locales?.includes(rawPath.split("/")[1]) ||
     // If we don't use locales, we don't need to add the default locale
     locales === undefined;
   const localizedPath = routesAlreadyHaveLocale