feat: sync DM packagechooser to netinstall-add with inline groups

- packagechooser_dm.conf (runtime + online ref): switch from netinstall-select
  to netinstall-add, move SDDM/LightDM/LXDM/greetd/LY packages inline into the
  chooser items; both copies byte-identical in content
- netinstall.yaml (runtime + online ref): drop the now-inline DM groups; bring
  the online ref's Default group in line with runtime (add falkon,
  networkmanager, pipewire, wireplumber)

iso-profiles/antergos/live-overlay/etc/calamares/modules/netinstall.yaml

@@ -96,38 +96,4 @@
 
 
 
-- name: "SDDM"
-  description: "SDDM display manager"
-  selected: false
-  packages:
-    - sddm
-    - sddm-dinit
-    - pixie-sddm-git
 
-- name: "LightDM"
-  description: "LightDM display manager"
-  selected: false
-  packages:
-    - lightdm
-    - lightdm-dinit
-
-- name: "LXDM"
-  description: "LXDM display manager"
-  selected: false
-  packages:
-    - lxdm
-    - lxdm-dinit
-
-- name: "greetd"
-  description: "greetd display manager"
-  selected: false
-  packages:
-    - greetd
-    - greetd-dinit
-
-- name: "LY"
-  description: "LY display manager"
-  selected: false
-  packages:
-    - ly
-    - ly-dinit

iso-profiles/antergos/live-overlay/etc/calamares/modules/packagechooser_dm.conf

@@ -1,7 +1,7 @@
 ---
 mode: required
 
-method: netinstall-select
+method: netinstall-add
 
 labels:
     step: "Display Manager"
@@ -14,23 +14,59 @@ items:
       name: sddm
       description: "QML-based display manager (KDE default)"
       screenshot: ""
+      netinstall:
+        name: "SDDM"
+        selected: true
+        critical: false
+        packages:
+          - sddm
+          - sddm-dinit
+          - pixie-sddm-git
 
     - id: LightDM
       name: lightdm
       description: "Cross-desktop display manager (GTK)"
       screenshot: ""
+      netinstall:
+        name: "LightDM"
+        selected: true
+        critical: false
+        packages:
+          - lightdm
+          - lightdm-dinit
 
     - id: LXDM
       name: lxdm
       description: "Lightweight display manager (LXDE)"
       screenshot: ""
+      netinstall:
+        name: "LXDM"
+        selected: true
+        critical: false
+        packages:
+          - lxdm
+          - lxdm-dinit
 
     - id: greetd
       name: greetd
       description: "Minimal display manager (recommended for COSMIC)"
       screenshot: ""
+      netinstall:
+        name: "greetd"
+        selected: true
+        critical: false
+        packages:
+          - greetd
+          - greetd-dinit
 
     - id: LY
       name: ly
       description: "Minimal TUI display manager"
       screenshot: ""
+      netinstall:
+        name: "LY"
+        selected: true
+        critical: false
+        packages:
+          - ly
+          - ly-dinit