Update SWCommandUtils SteamwarUser mapper

SpigotCore_Main/src/de/steamwar/sql/SteamwarUser.java

@@ -115,6 +115,7 @@ public class SteamwarUser {
 				}
 				return steamwarUsers;
 			}, userName.toLowerCase() + "%");
+			byPrefix.put(userName.toLowerCase().substring(0, 1), users);
 		}
 		return users.stream().filter(user -> user.getUserName().toLowerCase().startsWith(userName.toLowerCase())).collect(Collectors.toList());
 	}