Bug 20144: [sql_modes] Fix generated value for account_offsets.amount

Bug 20144: [sql_modes] Fix generated value for account_offsets.amount

Fix error:
Out of range value for column 'amount'

DBD::mysql::st execute failed: Out of range value for column 'amount' at
row 1 [for Statement "INSERT INTO `account_offsets` ( `amount`,
`debit_id`, `type`) VALUES ( ?, ?, ? )" with ParamValues:
0=7925469795795194609664.000000, 1='10', 2='Manual Debit'] at
/usr/share/perl5/DBIx/Class/Storage/DBI.pm line 1832.

7925469795795194609664.000000
=> Should be lower anyway

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>