Fixed an issue breaking the "lastinv" command

Fixed a long-standing issue causing the "lastinv" command to behave unexpectedly. It was caused by a SWEP:Deploy function that didn't end with "return true", likely because returning true would cause the view model to be drawn. I have replaced this function with something that works to the same effect, but preserves lastinv functionality.

It's a simple change, and shouldn't cause any issues.