Bug 26298: Don't set too_many_items_to_process if equal to limit

Bug 26298: Don't set too_many_items_to_process if equal to limit

In the code we prepare items for display if less than or equal to the pref, but we don't allow
the edit if greater than or equal to the pref. The second case should be only 'greater than'

To test:
 1- Set MaxItemsToProcessForBatchMod to 1000
 2- Go to Reports
 3- Make a report for itemnumbers that will give you at least 1000 items (ex. SELECT itemnumber FROM items)
 4- Save and run the report
 5- In "Rows per page", choose 1000
 6- Click on "Batch operations with 1000 visible records" > Batch item modification
 7- Notice that the item modification form isn't there and that the message says "Too many items (1000): You are not allowed to edit more than 1000 items in a batch."
 8- Apply patch
 9- Restart all the things
10- Run the report again and display 1000 rows
11- Click on "Batch operations with 1000 visible records" > Batch item modification
12 - Sucess!

Signed-off-by: Barbara Johnson <barbara.johnson@bedfordtx.gov>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit ae76d7626b0a23830b0269c00cbc2be73720d9ec)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>