[Locale] Rolled back normalizeIcuVersion() method in unit tests.

This makes it consistent with 2.0 and 2.1.

We just need to check if version is 4.4 or 4.8 and we do not need to know if it is 4.8.0 or 4.8.1.1 (at least for now there are no big differences between minor ICU versions).