chore: Add autorouted tht_db25_to_tht_db25 screenshot to gallery

tests/unilayer/tht_db25_to_tht_db25/tht_db25_to_tht_db25.kicad_prl

@@ -1,7 +1,7 @@
 {
   "board": {
     "active_layer": 25,
-    "active_layer_preset": "All Layers",
+    "active_layer_preset": "",
     "auto_track_width": true,
     "hidden_netclasses": [],
     "hidden_nets": [],
@@ -33,7 +33,6 @@
       "footprint_text",
       "footprint_anchors",
       "ratsnest",
-      "grid",
       "footprints_front",
       "footprints_back",
       "footprint_values",
@@ -49,7 +48,7 @@
       "conflict_shadows",
       "shapes"
     ],
-    "visible_layers": "ffffffff_ffffffff_ffffffff_ffffffff",
+    "visible_layers": "ffffffff_ffffffff_ffffffff_ffffff5f",
     "zone_display_mode": 0
   },
   "git": {