Bug 29449: Show userid on "Personal details" tab

Bug 29449: Show userid on "Personal details" tab

To reproduce:
- Login to the OPAC
- Go to the "Personal details" tab
- Verify the Username/userid of the logged in user is not
  shown anywhere

To test:
- Apply this patch
- Reload the "Personal details" tab
- Verify that "Username:" and the userid is now shown below the
  "Library card number"
- Try adding "userid" to PatronSelfModificationBorrowerUnwantedField
  and verify the field is hidden as expected
- Log out
- Go to "Don't have an account? Register here."
- Verify "Username:" is *not* shown
- Sign off

Signed-off-by: Laura Escamilla <laura.escamilla@bywatersolutions.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>