Basic reformat of section in Search.pm

Basic reformat of section in Search.pm

In for loops, replace all-inclusive conditional blocks like:
    for (@foo) {
        if (test) {
            block;
        }
    }

with conditional use of "next":
    for (@foo) {
        test or next;
        block;
    }

This reduces the number of unnecessarily nested blocks, and the
overall number of lines.

Signed-off-by: Henri-Damien LAURENT <henridamien@koha-fr.org>