fix: interior pickable metal doors can now pick on examine

[chaosvolt]

Purpose of change

This fixes examining interior pickable metal doors not automatically lockpicking like they're supposed to. They worked just fine on manually activating a lockpick, but not on examine.

Turns out the problem is examine_action doesn't inherit right. Also found out that it needs to inherit lockpick_message too.

Describe the solution

Adds lockpick_message and examine_action to pickable interior doors.

Describe alternatives you've considered

Finding the inheritance code responsible for this and figuring out how to add proper inheritance for those things? Not sure where to look for that and this is faster so.

Testing

1. Checked affected file for syntax and lint errors.
2. Ported JSON change to playthrough build.
3. Can now pick open the military outpost doors I was previously unable to, and correct message prints.

Additional context

Checklist