Fix the Lisbon map (#2713)

## Description:
Fixes 2 of the unconnected river tiles on the Lisbon map.

## 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:

DISCORD_USERNAME
Duwibi

resources/maps/lisbon/manifest.json

@@ -1,17 +1,17 @@
 {
   "map": {
     "height": 1600,
-    "num_land_tiles": 1495986,
+    "num_land_tiles": 1495857,
     "width": 1600
   },
   "map16x": {
     "height": 400,
-    "num_land_tiles": 90227,
+    "num_land_tiles": 90194,
     "width": 400
   },
   "map4x": {
     "height": 800,
-    "num_land_tiles": 369447,
+    "num_land_tiles": 369383,
     "width": 800
   },
   "name": "Lisbon",