Bug 19258: Preventing warns when paying a fine or charge from Pay selected button

Bug 19258: Preventing warns when paying a fine or charge from Pay selected button

The following warns are triggered when I click the Pay selected button:
CGI::param called in list context from package
CGI::Compile::ROOT::home_vagrant_kohaclone_members_pay_2epl line 267,
this can lead to vulnerabilities. See the warning in "Fetching the
value or values of a single named parameter" at
usr/share/perl5/CGI.pm line 436.
CGI::param called in list context from package
CGI::Compile::ROOT::home_vagrant_kohaclone_members_pay_2epl line
273, this can lead to vulnerabilities. See the warning in "Fetching
the value or values of a single named parameter" at
/usr/share/perl5/CGI.pm line 436.

To test:
1) Go to a members detail page in staff side and create a manual
invoice
2) Go to the pay fines tab, select the fine you just created and click
Pay selected
3) Notice warns
4) Apply patch and repeat steps 1 & 2
5) Warns should be gone

Sponsored-by: Catalyst IT
Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit ddf494b18f6c422d3654b0a78a63be86f5356065)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>