T-junction limit request revived after the SDK 2013 update

Akabenko pointed out on the old T-junction limit request that ficool2's pull request removing T-junction errors landed in Source SDK 2013. Cynosphere listed other limits raised in the latest TF2/SDK 2013 update, such as brushes going from 8192 to 32768. The request was closed as completed on 6 October; commit efb205 applies the T-junction softcap.