bug_2830: Remove reserve when checking out if the borrower is not the first one in...

bug_2830: Remove reserve when checking out if the borrower is not the first one in the reserve queue

To test:
Create 4 holds on a bib, for patrons A, B, C, and D,

Check in the item to mark hold as waiting for patron A
Check out the item to patron B -> reserve for patron B should be removed
Check in the item to mark hold as waiting for patron A
Check out the item to Patron A, hold should complete normally
Check in the item to mark hold as waiting for patron C
Check out the item to patron D -> reserve for patron D should be removed.
Check in the item to mark hold as waiting for patron C
Check out the item to patron C, hold should complete normally
Check in the item -> there should be no more reserves.

We also tested:
Created 4 holds on a bib with two items, for patrons A, B, C, and D

All worked as expected.

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>