Mark all on "Print Requested QSLs" does not work"

[dg3feh]

Describe the bug

The "mark all" check box on the left top does not work on page "Print Requested QSLs" does not work"

To Reproduce Steps to reproduce the behaviour:

just click the check box on this page

Expected behaviour All QSOs are marked after ticking the box.

Selfhosted v2.6.18 on Ubuntu

Desktop (please complete the following information):

• OS: Linux/Win
• Browser: Firefox/Chrome
• Version