Bug 21853: (follow-up) to solve printpdf error

Bug 21853: (follow-up) to solve printpdf error

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Theoretically this follow-up makes no difference. All modules only export
printpdf and now we are just asking explicitly for printpdf. But if it
resolves some exception on the rule..

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit 5b62714e47d5acd0a4c371024edacc02cfe6f5b5)

Signed-off-by: Jesse Maseto <jesse@bywatersolution.com>
(cherry picked from commit 21536e3314091778c9baf2984097715e071abfbc)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>