Fix Australia and Iceland chance (#550)

## Description:
This PR fixes the chances of the Iceland and Australia maps being
picked.
fixes #551

## Please complete the following:

- [ ] I have added screenshots for all UI updates
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

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

Nikola123

src/server/MapPlaylist.ts

@@ -86,8 +86,8 @@ export class MapPlaylist {
           Africa: 2,
           Britannia: 1,
           GatewayToTheAtlantic: 2,
-          Australia: 1,
-          Iceland: 1,
+          Australia: 2,
+          Iceland: 2,
           SouthAmerica: 3,
           KnownWorld: 2,
         };