Bug 19076 - Move issue logging in AddIssue into condtional clause

Bug 19076 - Move issue logging in AddIssue into condtional clause

Currently AddIssue tests if renewal, but logs an issue even if so. This
patch moves the logging into the conditional so a log entry is only
added if we aren't renewing (as renewals are logged separately)

To test:
1 - prove t/db_dependent/Circulation.t - one test should fail
2 - Enable both issue and renewal logs
3 - Checkout an item to a patron
4 - View the logs - the issue is captured
5 - Checkout the item to the patron again and confirm renewal
6 - Both an issue and a renewal are logged
7 - Apply patch
8 Repeat 1-6, tests should pass and only renewal should be logged

Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>