Well I was able to solve my own problem, although I'm a little disappointed that someone more experienced than me didn't think of this solution and save me a bit of trouble!

I just added a new inventory item (I called it inventory shrinkage adjustment just so I would know what it was), I entered starting quantity of -1, and a cost value of the exact amount of the inventory shrinkage that was showing on my report.  Then I went into that item and did a quantity adjustment to 0. This in effect added back the exact amount of my shrinkage to the shrinkage account.  So now, my profit and loss report shows inventory adjustment - $0.00.  Problem solved!