distrodata: Remove unnecessary include of package_regex.inc
This causes a warning when follow documentation to use distrodata
class that points to include,
include conf/distro/include/distro_alias.inc
include conf/distro/include/recipe_color.inc
include conf/distro/include/maintainers.inc
include conf/distro/include/upstream_tracking.inc
include conf/distro/include/package_regex.inc
INHERIT+= "distrodata"
