Once you're done editing, it's time to save the device... but there are a few things you have to do first in order to make it work as it should.
First of all, you have to put the live.drop back where it was. It is transparent, so you don't see it... but, as it's quite big, it should be easy enough to find clicking on the general area where you moved it before. Once you've found it (the semi-transparent squares are once again your friends), open the object inspector1 the same way you did for the controllers.
Check if the title bar2 says live.drop (if it doesn't you have selected the wrong thing) and, inside the inspector, look for the Presentation Rectangle value3 (it's in the Appearance section under either the Layout or All tabs4). Change it to: 0. 0. 1176. 169. and press enter.
Now that the live.drop is fixed, you have to lock and freeze5 the device, so that all the external files (in this case JS) gets included in it.
When you've done that, you can save the device, close the patch editor window and go back to Live.
Congratulations, you're done!