Remove an incorrect change wheel check.

Removed part of a check on wheels that is unnecessary. It looks like it was copy-and-pasted from the check on fuel above it.

For fuel, it's correct, as it's seeing if the fuel tank is at less than max capacity.

For wheels, it makes no sense, because they don't have an "amount". It's always 0, and wheels have nonzero size, so the check always evaluates to `true`. It's harmless, but pointless, and can be removed.