[Fixed] Batman vol. 3 #50

The virgin variant of the Nick Derington cover #50AE has a UPC ending in 178, not 176, which is correctly attributed to the trade dress.

I double-checked the entries in Core but #50AD - the trade dress - has 76194135962500176

while #50AE - the virgin variant - has 76194135962500178 for a barcode.

This is correct, right?