Bug 6503 - Variable $sth is declared 3 times (with keyword "my") in "makepayment...

Bug 6503 - Variable $sth is declared 3 times (with keyword "my") in "makepayment" sub of "Accounts.pm"

In the code available today (14-Jun-2011), in Koha git's "master" branch,
the file "Accounts.pm" (in the "C4" directory) has the variable "$sth"
declared 3 times in the "makepayment" sub. This causes the following
warnings to appear when running "make test" in Koha installation, for
several tests:
t/Heading.t ......................... "my" variable $sth masks earlier declaration
in same scope at kohaclone/blib/PERL_MODULE_DIR/C4/Accounts.pm line 172.
"my" variable $sth masks earlier declaration in same scope at
kohaclone/blib/PERL_MODULE_DIR/C4/Accounts.pm line 188.
[...]
t/ILSDI_Services.t .................. "my" variable $sth masks earlier declaration
in same scope at kohaclone/blib/PERL_MODULE_DIR/C4/Accounts.pm line 172.
"my" variable $sth masks earlier declaration in same scope
at kohaclone/blib/PERL_MODULE_DIR/C4/Accounts.pm line 188.
[...etc...]

Therefore, I'm removing the "my" keyword from the declarations of "$sth"
in lines 172 and 188 of "Accounts.pm".

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>