Fix use of CenterAwareComputerOp
Fix use of CenterAwareComputerOp

Since the refactoring of CenterAwareComputerOp to BinaryOp, a
CenterAwareComputerOp<I, O> implicitely uses I and Iterable<I> as input
for the computation.

gab1one/imagej-ops,imagej/imagej-ops,stelfrich/imagej-ops