scripts: Add display specs for Xiaomi Pad 6

Author: nullpointer1101

ui_scripts/test_display.sh

@@ -26,6 +26,7 @@ declare -A DEVICES=(
     ["OnePlus 13R"]="1264x2780 450"
     ["Nothing Phone 2"]="1080x2412 420"
     ["Nothing Phone 2a"]="1080x2412 390"
+    ["Xiaomi Pad 6"]="1800×2880 400"
     ["Xiaomi 14"]="1200x2670 440"
     ["Redmi Note 13 Pro"]="1220x2712 446"
     ["Tecno Pova LG7n"]="1080x2400 356"
@@ -48,6 +49,7 @@ SORTED_KEYS=(
     "Nothing Phone 2"
     "Pixel 9"
     "Pixel 8a"
+    "Xiaomi Pad 6"
     "Xiaomi 14"
     "POCO X6 Pro (duchamp)"
     "Redmi Note 13 Pro"