Bug 32937: Make Zebra ignore the copyright symbol in searches

Bug 32937: Make Zebra ignore the copyright symbol in searches

It's common to catalog the year with the copyright symbol attached
to it. This creates some issues with search that we can fix by
adding the © to the list of characters Zebra ignores in search.

To test:
* Search for any existing publication year with ©, example: ©1951
* Verify your record is not found
* Add the copyright symbol to a record, verify it's now found with ©,
  but not without
* Apply patch
* On ktd:
  * sudo cp -i /kohadevbox/koha/etc/zebradb/etc/word-phrase-utf.chr  /etc/koha/zebradb/etc/word-phrase-utf.chr
  * sudo koha-zebra --restart kohadev
  * sudo koha-mysql kohadev
  * DELETE FROM biblio WHERE biblionumber = 369;
  * The reindex woudl fail for me with this broken record present.
  * sudo koha-rebuild-zebra -f kohadev
* Repeat searches, the records should be found when searching
  with and without ©.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>