Bug 21961: Fix typo in manage_didyoumean permission

Bug 21961: Fix typo in manage_didyoumean permission

The typo in the installer files will cause problems on new
installations as the code for the permission is wrong.

This means that on new installations the Did you mean? section
on the administration page won't show up.

In order to fix this, we need to correct the code in
permissions, but also the permissions for users who
this permission has been given to.

To test:
- Start without the patch
- Use a new installation with the permission typo
- Log in as superlibrarian
- Verify that the "did you mean?" configuration page
  is not visible
- Create another staff user with permission to access
  staff and manage_didyoumean checked
- Verify configuration page remains invisible
- Apply patch and run database update
- Check both users again, the config page should now sohw

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>