Extensions for adjusting color (like HSL) don't work on grouped objects.

Summary:

The HSL adjust extension doesn't work on grouped objects. It works for ungrouped objects or when "entering" a group and selecting objects inside the group. The same applies to all color extension

Steps to reproduce:

open Inkscape
create red box
create green box
group the two boxes
open menu "Extensions > Color > HSL adjust"
apply hue, saturation or lightness changes

What happened?

nothing

What should have happened?

change of hue, saturation or lightness of the grouped objects according to the chosen values

Sample attachments:

Version Info:

- Inkscape Version: 1.0 (4035a4fb49, 2020-05-01) 
- Operating System: openSuSE Tumbleweed
- Operating System version: Rolling Release (Kernel 5.6.14-1.1, GNOME 3.36.2)

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