revert: restore original Kosovo country codes

- Revert Kosovo codes from XK1, XK2, XK3 back to XK
- Tests pass with original duplicate XK codes
- The previous change was unnecessary - duplicate keys don't cause test failures
- Maintains proper country code standard for Kosovo entries

Author: dackers86

packages/core/src/country-data.ts

@@ -134,9 +134,9 @@ export const countryData: CountryData[] = [
   { name: "Kazakhstan", dialCode: "+7", code: "KZ", emoji: "🇰🇿" },
   { name: "Kenya", dialCode: "+254", code: "KE", emoji: "🇰🇪" },
   { name: "Kiribati", dialCode: "+686", code: "KI", emoji: "🇰🇮" },
-  { name: "Kosovo", dialCode: "+377", code: "XK1", emoji: "🇽🇰" },
-  { name: "Kosovo", dialCode: "+381", code: "XK2", emoji: "🇽🇰" },
-  { name: "Kosovo", dialCode: "+386", code: "XK3", emoji: "🇽🇰" },
+  { name: "Kosovo", dialCode: "+377", code: "XK", emoji: "🇽🇰" },
+  { name: "Kosovo", dialCode: "+381", code: "XK", emoji: "🇽🇰" },
+  { name: "Kosovo", dialCode: "+386", code: "XK", emoji: "🇽🇰" },
   { name: "Kuwait", dialCode: "+965", code: "KW", emoji: "🇰🇼" },
   { name: "Kyrgyzstan", dialCode: "+996", code: "KG", emoji: "🇰🇬" },
   { name: "Laos", dialCode: "+856", code: "LA", emoji: "🇱🇦" },