RFR: 8264792: The NumberFormat for locale sq_XK formats price incorrectly.

[Naoto Sato]

Please review the fix to the subject issue. The root cause of this problem is that the currency for the country code `XK` is undefined because the country code is user-defined in the ISO 3166 standard. However, it is commonly used to represent the region `Kosovo`, which CLDR supports and subsequently is supported by the JDK since JDK9. Adding the data `EUR` for the country code `XK` will fix the issue.

-------------

Commit messages:
 - 8264792: The NumberFormat for locale sq_XK formats price incorrectly.

Changes: https://git.openjdk.java.net/jdk/pull/5033/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5033&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264792
  Stats: 13 lines in 3 files changed: 6 ins; 0 del; 7 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5033.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5033/head:pull/5033

PR: https://git.openjdk.java.net/jdk/pull/5033