Vgstation13: getMob does not clear locked_to var

[Aurx]

Description of issue

Teleported some faggot who was buckled into a bed. He remained buckled 5eva.

Difference between expected and actual behavior

Expected: Them to be able to move and stand.
Actual: Utter immobility.
Suspected to apply to other forms of teleportation, including those available to players.

Steps to reproduce

Spawn DrCelt.
Buckle DrCelt to a bed.
Right-click on DrCelt.
Use get_mob verb on DrCelt.
Laugh at DrCelt as he is unable to move under his own power.

Specific information for locating

locked_to var is not being cleared.

Length of time in which bug has been known to occur

I remember this sort of shit from like, 2012, man. Not sure if it's this exact shit, but teleportation and beds have never gotten along.

Server revision

Game: 0437d5f78554553cac791d917c15f982338dfc2f
Patches: 1f151d7a38ff2301172c5585b8ec3a972ca3efe6
Current Infomational Settings:
Protect Authority Roles From Tratior: 1

Issue bingo

• [x] Issue could be reproduced at least once
• [x] Issue could be reproduced by different players
• [ ] Issue could be reproduced in multiple rounds
• [x] Issue happened in a recent (less than 7 days ago) round
• [variations on this have happened for literally forever, fix it already please] [Couldn't find an existing issue about this](https://github.com/d3athrow/vgstation13/issues)

[Anglosphere]

This also occurs with chairs.

You can fix it by wrenching the chair into metal currently though. It unstucks whoever was sitting in it.

[Pathid]

Should we just have teleport_to() call unlock_from()?

[ghost]

WHY ME I WASN'T EVEN LOGGED IN THIS IS BULLYING