Comment 2 for bug 1882825

Here's a branch (untested) to fix this: https://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/sandbergja/lp1882825_add_missing_setting_for_booking_pull_list_grid

Also available at sandbergja/lp1882825_add_missing_setting_for_booking_pull_list_grid

Here are some testing steps from the commit message:

[1] Go to the Booking Pull List.
[2] Change the grid around and try to save.
[3] Note in your browser console an error message: "Error saving columns: No user or workstation setting type exists for eg.grid.booking.pull_list"
[4] Run the database migration included in this commit.
[5] Repeat steps 1-2.
[6] Note that no error message appears.
[7] Try exiting Evergreen and coming back (using the same workstation). Note that your changes to the grid have stuck!