BUGFIX: User input for game length fixed

The program was ignoring user input because it processed it incorrectly (for some reason, it required a "d" to be placed before the amount of points the user wanted). This has been corrected to the behavior that seemed to be desired by the original code (setting the amount of points to whatever the player wants), although perhaps having this selection restricted to 15 or 30 might be reasonable, at least for Argentinean Truco.