Fix fallback for CSG1 terrain surfaces

Thanks to Duncan for finding the error

Author: Gymnasiast

objects/rct1/terrain_surface/rct1aa.terrain_surface.roof_red/object.json

@@ -14,7 +14,6 @@
     ],
     "noCsgImages": [
         { "path": "icon.png", "format": "raw", "x": 2, "y": 2 },
-        "$G1[28971..28976]",
         "$G1[2029..2085]"
     ],
     "strings": {

objects/rct1/terrain_surface/rct1ll.terrain_surface.roof_grey/object.json

@@ -14,7 +14,6 @@
     ],
     "noCsgImages": [
         { "path": "icon.png", "format": "raw", "x": 2, "y": 2 },
-        "$G1[28989..28994]",
         "$G1[2542..2598]"
     ],
     "strings": {

objects/rct1/terrain_surface/rct1ll.terrain_surface.rust/object.json

@@ -23,7 +23,7 @@
     ],
     "noCsgImages": [
         { "path": "icon.png", "format": "raw", "x": 2, "y": 2 },
-        "$G1[28977..28982]",
+        "$G1[2485..2541]",
         "$G1[2485..2541]"
     ],
     "strings": {

objects/rct1/terrain_surface/rct1ll.terrain_surface.wood/object.json

@@ -23,7 +23,7 @@
     ],
     "noCsgImages": [
         { "path": "icon.png", "format": "raw", "x": 2, "y": 2 },
-        "$G1[28977..28982]",
+        "$G1[2485..2541]",
         "$G1[2485..2541]"
     ],
     "strings": {