APCOND_AGE supports a special case, when if it's passed null as parameter, it reads the value of $wgAutoConfirmAge.
Given that APCOND_AGE_FROM_EDIT is conceptually very similar to APCOND_AGE, it should support the same special case of reading $wgAutoConfirmAge.
Acceptance criteria
- [ APCOND_AGE_FROM_EDIT, null ] is by definition the same as [ APCOND_AGE_FROM_EDIT, $wgAutoConfirmAge ].