Feature Request: If one model loaded lms unload should unload it without needing to select it

[YorkieDev]

Title.

Currently when you type the command lms unload you have to select the model to unload. If you have only one model loaded, it should do it automatically for you, you should only have to select it if you have multiple models loaded.

[CinnamonRolls1]

If nobody's working on this, I'd like to give it a try.

[CinnamonRolls1]

Should be solved by #304.