blankpad(niri): flip DP-2 to transform 270

DP-2 top bezel faces right; HDMI-A-1 stays at 90 (top bezel left).

dotfiles/zz-blankpad/niri/.config/niri/cfg/display.kdl

@@ -7,11 +7,11 @@
 //
 // Both external PM1601 panels run portrait. niri's transform is
 // counter-clockwise: "90" = panel's top bezel faces left, "270" = top bezel
-// faces right. Swap both values to flip the pair.
+// faces right. DP-2 turns the other way from HDMI-A-1.
 
 output "DP-2" {
     scale 1
-    transform "90"
+    transform "270"
     position x=1536 y=0
 }