I tried to make the change as you suggested. However, when I try to close the table to experiment it, I am asked if I wish to save the changes. I answer yes and then it doesn't let me close the Switchboard table...
As JHB has already said, all the code has been removed.
Unless you do have a backup, I'm afraid that all of this has been in vain because what you posted is unrecoverable.
There's no point copying this to a new database as the code is lost