btrfs: qgroup: Remove duplicated trace points for qgroup_rsv_add/release

Inside qgroup_rsv_add/release(), we have trace events
trace_qgroup_update_reserve() to catch reserved space update.

However we still have two manual trace_qgroup_update_reserve() calls
just outside these functions.  Remove these duplicated calls.

Fixes: 64ee4e75

 ("btrfs: qgroup: Update trace events to use new separate rsv types")
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>