Bluetooth: hci_core: Fix LE quote calculation

Function hci_sched_le needs to update the respective counter variable
inplace other the likes of hci_quote_sent would attempt to use the
possible outdated value of conn->{le_cnt,acl_cnt}.

Link: https://github.com/bluez/bluez/issues/915


Fixes: 73d80deb ("Bluetooth: prioritizing data over HCI")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>