Normalize user-facing defaults

roles/virtualization/defaults/main.yml

@@ -1,11 +1,10 @@
 ---
 virtualization_tpm2_enabled: >-
   {{
-    (partitioning_luks_enabled | default(luks_enabled | default(false)) | bool)
-    and (partitioning_luks_auto_decrypt | default(luks_auto_decrypt | default(true)) | bool)
+    (partitioning_luks_enabled | bool)
+    and (partitioning_luks_auto_decrypt | bool)
     and (
-      (partitioning_luks_auto_decrypt_method | default(luks_auto_decrypt_method | default('tpm2')))
-      | lower
+      (partitioning_luks_auto_decrypt_method | lower)
       == 'tpm2'
     )
   }}