fdo#76663: Better test to really test PRODUCT with array input.

The first element should be something other than 1 to make this a better
check.

Change-Id: I2dc108a2e755034f584fef781eb5668b629dc3fd
fdo#76663: Let's not skip the first element of a matrix in PRODUCT.

Change-Id: I00683ce64fea58a80cd7137384e8f30464c44e9f