The property courseid and groupid might not be set, so if updating,
use the existing value if a new value wasn't specified.

It's quite common to have more than 50 events in a calendar month, but
we do not want to change the default value when the API is called in
other ways.

Merge branch 'MDL-60527-action-menu-links-missing-spaces-attributes' of https://github.com/lucaboesch/moodle

Merge branch 'm34_MDL-59100_MySQL8_INFORMATION_SCHEMAs_Need_Lowercasing' of https://github.com/scara/moodle

The singlescobasic_missingorg.zip file includes a modified version of
the javascript which deliberately breaks content.

We need it to have different file names to not break other similar copies
of the file.