Current situation:
Wrench to girder (unsecured) -> secure girder
Wrench to girder (secured) -> disassemble girder
Crowbar to girder (secured) -> unsecure girder
This PR changes it to:
Wrench to girder (unsecured) -> secure girder (same as before)
Wrench to girder (secured) -> unsecure girder
Welder to girder (unsecured) -> disassemble girder
This is more consistent with nearly every other frame in the game, which have to be first unsecured with a wrench and then disassembled with a welder.