os_release: Update expected edition name for KDE

I think it should be OK to do this without any fancy conditions.
It'll fail for F41 respins, but eh. May fail for F42 nightlies
until we push the update stable.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

tests/os_release.pm

@@ -100,7 +100,7 @@ sub run {
         Workstation => ["workstation", "Workstation Edition"],
         AtomicHost => ["atomic.host", "Atomic Host"],
         CoreOS => ["coreos", "CoreOS"],
-        KDE => ["kde", "KDE Plasma"],
+        KDE => ["kde", "KDE Plasma Desktop Edition"],
         Silverblue => ["silverblue", "Silverblue"],
         IoT => ["iot", "IoT Edition"],
     );