Fix build issue with KIO linking
Fixes build issue:
CMake Error at src/accountwizard/CMakeLists.txt:35 (target_link_libraries):
Target "libaccountwizard" links to:
KF6::KIOCore
but the target was not found. Possible reasons include:
* There is a typo in the target name.
* A find_package call is missing for an IMPORTED target.
* An ALIAS target is missing.