Fixes toggling watertank nozzle in hands with verb

This does NOT completely fix the two current open watertank issues. @Ergovisavi is working on implementing NODROP for all the nozzles to fix the rest. This at least stops being able to toggle the nozzle when the tank is in your hand (Previously it only ever checks with the UI action button).

Also changed some of the messages to the user, the implied urgency of the exclamation mark bugged me.