Add map dyslexdria (#3568)

## Description:
Re Add map Dyslexdria. I adjusted the rivers to make boat traffic go
through main channels isntead of shortcuts. Flags adjusted. Correct
thumbnail added

## 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

## Discord username 
Plays Badly

src/core/game/Game.ts

@@ -145,6 +145,7 @@ export enum GameMapType {
   Aegean = "Aegean",
   MilkyWay = "MilkyWay",
   Mediterranean = "Mediterranean",
+  Dyslexdria = "Dyslexdria",
 }
 
 export type GameMapName = keyof typeof GameMapType;
@@ -211,6 +212,7 @@ export const mapCategories: Record<string, GameMapType[]> = {
     GameMapType.TradersDream,
     GameMapType.Passage,
     GameMapType.MilkyWay,
+    GameMapType.Dyslexdria,
   ],
   arcade: [
     GameMapType.TheBox,