Bug 38303: Set item's replacement price to defaultreplacecost if 0.00

Bug 38303: Set item's replacement price to defaultreplacecost if 0.00

No idea if this is a real bug. This code is fixing the following test
failure:
t/db_dependent/Circulation/CalcFine.t .. 1/7
    #   Failed test 'Amount is calculated correctly'
    #   at t/db_dependent/Circulation/CalcFine.t line 271.
    #          got: '0'
    #     expected: '6'
    # Looks like you failed 1 test of 2.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Aleisha Amohia <aleishaamohia@hotmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>