tests: fix lxd-mount-units in ubuntu jammy

The lxd image used in jammy is seeded with core22 snap.

Author: sergiocazzolato

tests/main/lxd-mount-units/task.yaml

@@ -24,7 +24,7 @@ execute: |
 
     # Define the core snap for the current system
     core_snap=core20
-    if os.query is-ubuntu-gt 22.04; then
+    if os.query is-ubuntu-ge 22.04; then
         core_snap=core22
     fi