Cmake: Make format-xml target only search for data/*.xml
Cmake: Make format-xml target only search for data/*.xml

It used to search for *.XML too, but now there are no UPPERCASE files
left this was no longer needed, and could cause issues on
case-insensitive filesystems (as files would get picked up by both
globs)

pmprog/OpenApoc,FranciscoDA/OpenApoc,Istrebitel/OpenApoc,steveschnepp/OpenApoc,FranciscoDA/OpenApoc,pmprog/OpenApoc,steveschnepp/OpenApoc,Istrebitel/OpenApoc,FranciscoDA/OpenApoc