Bug 32012: runreport.pl should use binmode UTF-8

Bug 32012: runreport.pl should use binmode UTF-8

Like Bug 26832 added binmode UTF-8 to script misc/search_tools/export_elasticsearch_mappings.pl, this should be added to misc/cronjobs/runreport.pl.

Test plan :
1) Do not apply patch
2) Create a SQL report with :
   SELECT 'accentué',barcode FROM items limit 3
3) Note the id of this report, for example 1
4) Run : misc/cronjobs/runreport.pl 1 --format csv | tee /tmp/without.csv
=> You see output with unknown character instead of é :
5) Run : file --mime-type /tmp/without.csv
=> You see : /tmp/without.csv: iso-8859-1
6) Apply patch
7) Run : misc/cronjobs/runreport.pl 1 --format csv | tee /tmp/with.csv
=> You see correct output with é
8) Run : file --mime-type /tmp/without.csv
=> You see : /tmp/without.csv: utf-8

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>