fix: fixed ArrayIndexOOB in getting characters

src/main/java/uulm/teamname/marvelous/gamelibrary/gamelogic/GameLogic.java

@@ -735,7 +735,7 @@ public class GameLogic {
         }
 
         int p1 = selectedCharacters1.size();
-        int all = selectedCharacters1.size() + selectedCharacters2.size();
+        int all = selectedCharacters1.size() + selectedCharacters2.size() - 1; // this is the highest index + 1
 
         ArrayList<Integer> characters = new ArrayList<>(selectedCharacters1);
         characters.addAll(selectedCharacters2);