Consent checkbox appears on /admin/people/create page too

Problem/Motivation

Steps to reproduce:

1. On the module's config page admin/config/gdpr/compliance the "Enable on user registration" option is checked.
2. Expected: administrator still should be able to create other user accounts via the /admin/people/create page.
3. Result: the "I have read and agree to the Cookie & Privacy Policy" option appears even on the /admin/people/create page too, and Chrome's client-side validation blocks the form submission as the consent is mandatory. This way administrator cannot create new user entities:

Proposed resolution

Ensure that the module handles separately the /user/register and /admin/people/create forms.

Remaining tasks

Figure out where to place a proper IF condition (in routing check maybe?), then diff a patch, test and commit.

User interface changes

Site administrators should be able again to create user accounts while the module is active on the registration page.

Raising priority to Major, because causing regression on a core feature.