Fix snappy-snap-automated misplaced to manual plan (BugFix) (#801)

Fix snappy-snap-automated misplaced to manual plan

snappy-snap-automated was added into client cert desktop plan with pull
request #663. When nesting to
the desktop plan, it was misplaced to manual plan on
client-cert-desktop-22-04.pxu. 20-04 and 18-04 didn't misplace. This
commit fixes it to move the snappy-snap-automated to auto plan.

providers/certification-client/units/client-cert-desktop-22-04.pxu

@@ -42,7 +42,6 @@ nested_part:
     networking-cert-manual
     optical-cert-manual
     power-management-precheck-cert-manual
-    snappy-snap-automated
     touchpad-cert-manual
     touchscreen-cert-manual
     usb-cert-manual
@@ -117,6 +116,7 @@ nested_part:
     networking-cert-automated
     optical-cert-automated
     power-management-precheck-cert-automated
+    snappy-snap-automated
     touchpad-cert-automated
     touchscreen-cert-automated
     usb-cert-automated