Drop removed Hyprland dwindle:pseudotile option

Current Hyprland no longer accepts dwindle:pseudotile (it's a dispatcher now),
which threw a non-fatal config-error banner on both the live and installed
desktop. preserve_split is still valid and kept.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

dotfiles/hypr/hyprland.conf

@@ -46,7 +46,6 @@ input {
 }
 
 dwindle {
-    pseudotile = true
     preserve_split = true
 }
 

iso/airootfs/etc/skel/.config/hypr/hyprland.conf

@@ -46,7 +46,6 @@ input {
 }
 
 dwindle {
-    pseudotile = true
     preserve_split = true
 }