d/p/series: Add desktopManager-Avoid-scheduling-multiple-_layoutChil.patch

Daniel van Vugtrequested to merge
vanvugt/gnome-shell-extension-desktop-icons:fix-lp1898005-focal-take-two into ubuntu/focal

Add patch desktopManager-Avoid-scheduling-multiple-_layoutChil.patch to debian/patches/series to fix LP: #1898005 properly. The patch got released in the previous version without being in the series file.

Also import release 20.04.0-3~ubuntu20.04.4 from the Ubuntu archive.

A new changelog entry will be required after this lands.

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