Correct error interpreting vcard timestamp size

This requires an upgrade to the Android app to be useful but won't make the situation any worse for now.
2 jobs for master in 16 minutes and 59 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #19758
linux kf5-qt5 qt5.12

00:10:55

34.0%
passed #19759
windows
windows kf5-qt5 qt5.13

00:08:19