Corrected incorrect parameter reference

[chivalry]

Changed initial reference to ~file variable to instead reference file parameter.

[petrowsky]

We actually need to deprecate the ObjectID function as it was replaced by a breakout of the multiple functions within the Objects folder. I wish I had some time to do some major cleanup of this repo. I can merge based on trash, but you should switch to using the individual Object* functions.

[chivalry]

I actually do use a version of the individual functions, but I'm working on my own standard library of custom functions, trying to clean it up after years of cruft accumulation (https://github.com/chivalry/filemaker-custom-functions), and I was looking at your library for possible ideas, and just happened to find that error. Regardless of individual standards (if you take a look at my repository, you'll see a few areas where I depart from your standards), I love the fmpstandards as a resource. Thanks for making it available.