Bug 6268: (MT #6408) Bad Total in basket.pl

Bug 6268: (MT #6408) Bad Total in basket.pl

The total_est_gste or gsti is computed on the total_rrp_gste or gsti.
But in the budget this amount is the summ of discounts computed for each line.
Due to the rounding to 2 decimal places this produces a difference in Funds view with Total sublevels spent.

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
(cherry picked from commit 0d0b3ef9c2840633ae9860b66babeba3cb453b1b)

Signed-off-by: Chris Nighswonger <chris.nighswonger@gmail.com>