Bug 36716: Do special processing based on input id, not column index

Bug 36716: Do special processing based on input id, not column index

When a user clicks "Edit" ( .editrule ) we use JavaScript to loop
through each of the columns in the table to copy the appropriate values
into the input fields. Fields that need special processing are
identified by the column index, which can lead to problems when the
index varies between Koha versions or columns are shown/hidden based
on syspref settings.

In the current main, there is at least one such bug causing the
value for "no automatic renewal before" not to propagate, but to get
silently saved in the "no automatic renewal before (hard limit)" field
instead.

Identifying fields for special processing based on input id rather than
index should fix the above issue and avoid similar regressions.

To test:
1. Create a circulation rule that has:
    a) a value (such as 30) in the column "No automatic renewal after"
    b) no value in the column "No automatic renewal after (hard limit)"
2. Click the button to edit the circulation rule from step 1
--> The text field for "No automatic renewal after" is blank
3. Save the rule without making any changes
--> "No automatic renewal after" is now blank for this rule, but "No
    automatic renewal after (hard limit)" has a date in it
4. Apply patch
5. Repeat steps 1-3
--> "No automatic renewal after" and "No automatic renewal after (hard
     limit)" now preserve their values correctly
6. Create a circulation rule that has a non-default value in every field
7. Edit the circulation rule from step 6
--> Confirm that all values are copied to the edit fields correctly
8. Save the rule without making any changes
--> Confirm that the rule saved correctly
9. Create a circulation rule, leaving the following columns blank:
    "Current checkouts allowed"
    "Current on-site checkouts allowed"
    "Holds allowed (total)"
    "Holds allowed (daily)"
    "Holds per record (count)"
--> The above columns should display as "Unlimited"
10. Edit the rule from step 9
--> The input fields for the above columns should be blank
11. Save the rule without making any changes
--> The above fields should still display as "Unlimited"

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>