Don't show the "Override Lock" prompt when creating objects

Summary:
Fixes T12369. When you create objects they may technically be locked: either because the default state is legitimately locked, or because the default policies prevent you from viewing so we sort of technically end in a locked state.

Regardless, don't prompt during creation, since this prompt isn't useful even if the lock detection is completely legitimate.

Test Plan:

• In Applications → Maniphest → Configure, set "Default View Policy" to "No One".
• Tried to create a task.
• Before patch: prompted to override lock.
• After patch: no override prompt.

Reviewers: chad

Reviewed By: chad

Subscribers: d.maznekov

Maniphest Tasks: T12369

Differential Revision: https://secure.phabricator.com/D17541