Fix Amazon River Map 🏞️ (one row of pixels too much) (#2844)

## Description:

There was one row of white pixels at the top:

<img width="796" height="693" alt="image"
src="https://github.com/user-attachments/assets/5915c629-c2ce-4b3f-913a-bfe6e974561f"
/>

## Please complete the following:

- [X] I have added screenshots for all UI updates
- [X] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [X] I have added relevant tests to the test directory
- [X] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

FloPinguin

resources/maps/amazonriver/manifest.json

@@ -1,17 +1,17 @@
 {
   "map": {
-    "height": 280,
-    "num_land_tiles": 1172808,
+    "height": 276,
+    "num_land_tiles": 1150819,
     "width": 5536
   },
   "map16x": {
-    "height": 70,
-    "num_land_tiles": 71047,
+    "height": 69,
+    "num_land_tiles": 69690,
     "width": 1384
   },
   "map4x": {
-    "height": 140,
-    "num_land_tiles": 290101,
+    "height": 138,
+    "num_land_tiles": 284707,
     "width": 2768
   },
   "name": "Amazon River",