Always check exclusions in PackageUpdateAction::createQueue()

Always check exclusions in PackageUpdateAction::createQueue()

Ever since the method checked for package exclusions in
1d7f1d205ee64fd2723877c1f296c592518e516d it only applied the check to updates,
not to fresh installs. It's not clear why it did so, I assume this to be an
oversight.

Change this to always run the exclusion check, otherwise exclusions might be
circumvented using PackageUpdateAction::prepareInstallation() with a
package+version combination that would regularly be excluded.