Bug 7677: FIX QA issues

Bug 7677: FIX QA issues

 FAIL    C4/Serials.pm
   FAIL      forbidden patterns
    forbidden pattern: trailing space char (line 1501)
    forbidden pattern: trailing space char (line 921)

 FAIL    serials/serials-edit.pl
   FAIL      valid
        "my" variable $dbh masks earlier declaration in same scope

Signed-off-by: Brendan Gallagher <brendan@bywatersolutions.com>
http://bugs.koha-community.org/show_bug.cgi?id=7767

Signed-off-by: Katrin Fischer  <katrin.fischer@bsz-bw.de>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>