Link to printonly file is wrong

The link to the printonly PDF in the edit form of a printonly exam points to the solution PDF instead of the printonly PDF. E.g. the link for https://exams.vis.ethz.ch/exams/lh49rar6.pdf points to https://exams.vis.ethz.ch/api/exam/pdf/solution/lh49rar6.pdf/ instead of https://exams.vis.ethz.ch/api/exam/pdf/printonly/lh49rar6.pdf/.