Bug 31299: Fix duplicate output in search_for_data_inconsistencies.pl

Bug 31299: Fix duplicate output in search_for_data_inconsistencies.pl

In search_for_data_inconsistencies.pl when there are several inconsistencies on same framework, the second output of items contains the first one.

Looks like it is since Bug 21466

Test plan using koha-testing-docker :
1) Create 2 inconsistencies on the same item via SQL :
   update items set itemlost = 9 where itemnumber=900;
   update items set notforloan = 8 where itemnumber=900;
2) Without patch
3) Run ./misc/maintenance/search_for_data_inconsistencies.pl
=> You see duplicate output :
== Wrong values linked to authorised values ==
	* The Framework *BKS* is using the authorised value's category *NOT_LOAN*, but the following items.notforloan do not have a value defined ({itemnumber => value }):
 {900 => 8}
	* The Framework *BKS* is using the authorised value's category *LOST*, but the following items.itemlost do not have a value defined ({itemnumber => value }):
 {900 => 8} {900 => 9}

4) Apply patch
5) Run ./misc/maintenance/search_for_data_inconsistencies.pl
=> Fixed :D
== Wrong values linked to authorised values ==
	* The Framework *BKS* is using the authorised value's category *LOST*, but the following items.itemlost do not have a value defined ({itemnumber => value }):
 {900 => 9}
	* The Framework *BKS* is using the authorised value's category *NOT_LOAN*, but the following items.notforloan do not have a value defined ({itemnumber => value }):
 {900 => 8}

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>