Rename missed KF5I18nLocaleData reference
This was breaking the -DKI18N_EMBEDDED_ISO_CODES_CACHE=ON
build:
CMake Error at src/localedata/CMakeLists.txt:62 (target_sources):
Cannot specify sources for target "KF5I18nLocaleData" which is not built by
this project.
Fixes the remaining rename missed in !72 (merged)