Gripping wheelchair handle does nothing

[Ikmalmn]

Bug Description:
As the title says, gripping the handle of the wheelchair will not do anything to it. The message comes, but it does nothing.

Steps to reproduce:
1. Find wheelchair (one in cargo)
2. Drag wheelchair sprite to yours (a message on confirmation appears)
3. Walk and you will phase through it, not even pulling or pushing it.

[phil235]

Fixed by removing the gripping functionality.